Guest ScutulatusCrotalus Posted August 25, 2012 Report Share Posted August 25, 2012 Hello, I am kinda lost here. Most downgrade tutorials were written before ICS came to our devices, so I do not know if any of those are outdated or not. Is there any possibility to downgrade from B934 to B892(or B884, B885) to make official OTA updates available as on untouched devices and fully working? My current state is that I do have - CWM, rooted B934, and also backup files for my imei from B892 (only for B892, I have rooted and flashed my device after B892 update came for it). Could someone clarify what steps are valid to downgrade? I am not happy with ICS on it, battery life is shorter and UI is not that responsive as on B892 (and also my previous ZTE Blade had much more responsive UI than my G300). THank you so much. Link to comment Share on other sites More sharing options...
Guest wwwjunk Posted August 25, 2012 Report Share Posted August 25, 2012 (edited) I downgraded yesterday from b934 to b882. Did as i always do, and always work. Change imei to 0 flash rom i want via dload folder restore original imei (of course after rooting the device) PS: i've changed between lots of roms (almost all of them) this way and was always successful. I flash the rom i want directly Edited August 25, 2012 by wwwjunk Link to comment Share on other sites More sharing options...
Guest ScutulatusCrotalus Posted August 25, 2012 Report Share Posted August 25, 2012 I downgraded yesterday from b934 to b882. Did as i always do, and always work. Change imei to 0 flash rom i want via dload folder restore original imei (of course after rooting the device) PS: i've changed between lots of roms (almost all of them) this way and was always successful. I flash the rom i want directly So if I understood well - by downgrading from any ROM I have to zero my IMEI by installing an update, then flash any ROM I want and that it is - after it I have to restore my imei via 5irom. There are few things that I do not understand. Does IMEI backup depend on specific version of ROM - or does it depend on baseband? If I do have only B892 IMEI backup and if I only want to go back to stock B892, I presume that I would zero my IMEI, flash it straight, restore my original IMEI I backed up it before and I am done, right? Should be restoring done only when I am downgrading, right? The last thing that Daz has placed B892 on his mirror and it's located in cn folder - should I be concerned if this version of ROM is not UK? Just want to have clean vodafone UK rom, unrooted. if I summarize it: - zero ROM - flash B892 straight on my G300, no middle package - restore my B892 imei backup - done There's no need to go to B892 via B885 or B882, right? I do only have B892 imei backup. Sorry for my questions. I just want to be informed and to be sure. Also sorry for my poor english language. Link to comment Share on other sites More sharing options...
Guest Emmepi Posted August 25, 2012 Report Share Posted August 25, 2012 Take a look at the lasts posts here : Just put the right rom to SDCard in the right folder, shut off your G300, and power it on with (vol+ vol- power) combo I've downgraded from b934 to b888 without problem. No IMEI lost during downgrade Link to comment Share on other sites More sharing options...
Guest luvvt Posted August 25, 2012 Report Share Posted August 25, 2012 (edited) Your backed up imei number can be used to restore on any rom you flash, B8xx or B9xx. You have to use the downgrade 5irom files to zero your imei before you can downgrade from ics B9xx roms back to gingerbread B8xx roms. Also to flash across ics B9xx roms use the downgrade 5irom only if the Middle package doesnt work. (all these are in the pinned threads) As for the ota updates, If you install B882, root, restore imei, you will be able to use ota upgrades. However i have found that ota updates will not work if you have cwm installed. if I summarize it: - zero ROM - flash B892 straight on my G300, no middle package - root (note you will probably have to do a factory reset to re gain root after you have installed root) - restore my B892 imei backup - done Correct Please dont forget to make multple backups of your imei number and clearly mark them as being your original number Edited August 25, 2012 by luvvt Link to comment Share on other sites More sharing options...
Guest b4da55 Posted August 25, 2012 Report Share Posted August 25, 2012 Does middle rom zero imei Link to comment Share on other sites More sharing options...
Guest luvvt Posted August 25, 2012 Report Share Posted August 25, 2012 no, hang on a minute im looking for the link ps: re read my post i edited it Link to comment Share on other sites More sharing options...
Guest luvvt Posted August 25, 2012 Report Share Posted August 25, 2012 (edited) Its very important to read and understand this method before you try https://docs.google....QHNo/edit?pli=1 Ps the middle package is for ics roms only Edited August 25, 2012 by luvvt Link to comment Share on other sites More sharing options...
Guest ScutulatusCrotalus Posted August 25, 2012 Report Share Posted August 25, 2012 (edited) Well, tutorial from - Emmepi leads to same solution, as was my upgrading to B934 - big update.app, did not work, then middle, then big update.app, then vendor update.app. - tutorial from google docs does this the same, but with zeroing IMEI. Why is it so? luvvt: You've written that my IMEI backup from B892 will be compatible with all B8xx ROMs - so if I downgrade to B882, my IMEI was zero, then I should use my IMEI backup. Or should I upgrade then from B882 to B892 where my IMEI backup will be usable? Sorry for having too many questions, just want to know everything. Edited August 25, 2012 by ScutulatusCrotalus Link to comment Share on other sites More sharing options...
Guest luvvt Posted August 25, 2012 Report Share Posted August 25, 2012 (edited) I dont understand your last post. your trying to downgrade from B934 to B882 yes ?? Edit: Your backed up imei will be compatible with all roms B8xx gingerbread and B9xx ics Edited August 25, 2012 by luvvt Link to comment Share on other sites More sharing options...
Guest ScutulatusCrotalus Posted August 25, 2012 Report Share Posted August 25, 2012 Yes, I am. I'm just a bit confused, because there are two tutorials - the first one says the same as the second one, but adds restoring a modified imei - https://docs.google.com/document/d/1fHCqgv3Erj-IOAHssv20sxVMaphQJiVr3hebq9oQHNo/edit?pli=1the second one says the same as the first one, but without a modification of imei - Which one should I use? Link to comment Share on other sites More sharing options...
Guest luvvt Posted August 25, 2012 Report Share Posted August 25, 2012 This link is the g300 downgade 5irom folder https://docs.google.com/document/d/1fHCqgv3Erj-IOAHssv20sxVMaphQJiVr3hebq9oQHNo/edit?pli=1 It contains a hacked version of 5irom that will zero your imei. This is needed to downgrade from B9xx roms back to B8xx roms (you will have to do this) Your backed up version of 5irom you will use to restore your imei to its original number Ignore the middle package as this was specifically released with B927 B926 ics (I cant rememberwhich one) to allow upgade across ics roms Link to comment Share on other sites More sharing options...
Guest ScutulatusCrotalus Posted August 25, 2012 Report Share Posted August 25, 2012 Last thing that pushes me from downgrading is missing vendor update.app from B8xx ROMs. Without that I won't have original Huawei toggles and OTA from Vodafone won't work. Link to comment Share on other sites More sharing options...
Guest tcpaulh Posted August 25, 2012 Report Share Posted August 25, 2012 You don't need to zero your imei or change it in any way in order to downgrade. Taking a backup of it is a sensible precaution though. Link to comment Share on other sites More sharing options...
Guest luvvt Posted August 25, 2012 Report Share Posted August 25, 2012 Yep thats the problem no vendor updates and no toggles. I have downgraded mearly to get the official ics ota upgrade. i only want to see what it contains for me as all the ics roms are world wide or chinese versions and i am in nz. Im surprised though that you dont like B934 i found it much better than gingerbread, Check your setting especially the 2d redering, as this will slow thing up considerably Link to comment Share on other sites More sharing options...
Guest luvvt Posted August 25, 2012 Report Share Posted August 25, 2012 You don't need to zero your imei or change it in any way in order to downgrade. Taking a backup of it is a sensible precaution though. Are you sure Link to comment Share on other sites More sharing options...
Guest Rico_89 Posted August 25, 2012 Report Share Posted August 25, 2012 Well if you have a nandroid backup, of your previous GB installation, then after you downgrade to your desired B8XX rom, you could then recover your GB back up. Link to comment Share on other sites More sharing options...
Guest tcpaulh Posted August 25, 2012 Report Share Posted August 25, 2012 (edited) @luvvt, Yep at least on my phone and other positive reports Edited August 25, 2012 by tcpaulh Link to comment Share on other sites More sharing options...
Guest Rico_89 Posted August 25, 2012 Report Share Posted August 25, 2012 @luvvt, Yep at least on my phone and other positive reports Huh... :blink: ..downgrade without middle app or imei hack?? Never heard of that before. Link to comment Share on other sites More sharing options...
Guest ScutulatusCrotalus Posted August 25, 2012 Report Share Posted August 25, 2012 Im surprised though that you dont like B934 i found it much better than gingerbread, Check your setting especially the 2d redering, as this will slow thing up considerably Well, I really like ICS and JB, but official B934 is not that fast as I expected. Just realized that GB on G300 was much faster and ICS on ZTE Blade was also faster. Link to comment Share on other sites More sharing options...
Guest luvvt Posted August 25, 2012 Report Share Posted August 25, 2012 K my bad, Link to comment Share on other sites More sharing options...
Guest tcpaulh Posted August 25, 2012 Report Share Posted August 25, 2012 Huh... :blink: ..downgrade without middle app or imei hack?? Never heard of that before. Post #8 @ pressing both vol+, vol- and pwr. Middle package may be useful on occasion but I've never used it. Link to comment Share on other sites More sharing options...
Guest Rico_89 Posted August 25, 2012 Report Share Posted August 25, 2012 Post #8 @ http://www.modaco.co...8/#entry2011243 pressing both vol+, vol- and pwr. Middle package may be useful on occasion but I've never used it. Never seen that before.. you lucky dogs :P . I couldn't even upgrade to B927 from 26 without hacking my IMEI. Link to comment Share on other sites More sharing options...
Guest luvvt Posted August 26, 2012 Report Share Posted August 26, 2012 (edited) What happened to the difference in base bands, I am aware that flashind a nandroid backup of ics roms over ics roms has advantages as in B926 to B934 in regards to HSPA but i thought flashing a cwm img of B8xx over a B9xx rom wouldnt work as the base bands are different. For my sanity can someone please clear this up for me EDIT: Just read Garys post, may work on some phones otherwise use the hack method. Youd have to try first if it doesnt involve imei then all good. From some posts it seems that apon flashing new rom then imei has been zeroed anyway so just a preference thing I suppose Edited August 26, 2012 by luvvt Link to comment Share on other sites More sharing options...
Guest ScutulatusCrotalus Posted August 26, 2012 Report Share Posted August 26, 2012 Well, funny thing is that after my downgrade to B885 and then upgrade to B934 my phone became much faster, UI is more responsive - it's not that fast as on B8xx, but it's more usable than before. Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now