[GUIDE] Upgrade and Downgrade the G300 between GB, ICS and JB with downloads.

[Guest 2thin2swim]

Hi, thanks for these instructions. Slight problem...

From Section 6 (downgrading from ICS to vodafone GB), near the top:

• When prompted reboot your phone, By holding the Power Button down and selecting "Reboot" (I presume you mean "restart")
  
• The device will then begin a reboot loop this will go through many different stages and can take up to 5 minutes.
  
  At this stage, the phone just shows the Huawei logo, then goes into the CWM-based recovery screen. It then says "E:Invalid command argument" - Any advice?
  

Edited October 5, 2012 by 2thin2swim

[Guest portachking]

Hi, thanks for these instructions. Slight problem...

From Section 6 (downgrading from ICS to vodafone GB), near the top:

• When prompted reboot your phone, By holding the Power Button down and selecting "Reboot" (I presume you mean "restart")
  
• The device will then begin a reboot loop this will go through many different stages and can take up to 5 minutes.
  
  At this stage, the phone just shows the Huawei logo, then goes into the CWM-based recovery screen. It then says "E:Invalid command argument" - Any advice?
  

I came here to ask the exact same question. Same issue exactly.

[Guest 2thin2swim]

Why am I getting a panicky feeling about this...? Have I screwed the pooch?

[Guest Cyda]

Try pulling the battery for 30 seconds and then try restarting the phone. I've known this error to happen at times and a battery pull to cure it.

[Guest droiddruid]

Continue following the guide, specifically the steps involving CWM.

[Guest 2thin2swim]

Try pulling the battery for 30 seconds and then try restarting the phone. I've known this error to happen at times and a battery pull to cure it.

Tried that - in fact, its the only way to break the cycle.

[Guest 2thin2swim]

Continue following the guide, specifically the steps involving CWM.

Can't try that - locked in a vicious "OFF < > CWM screen" loop. But thanks for the attempt.

Is this the only possible solution?

[Guest Cyda]

Can't try that - locked in a vicious "OFF < > CWM screen" loop. But thanks for the attempt.

Is this the only possible solution?

As you can get in to CWM, have you tried flashing a new ROM?

[Guest droiddruid]

From the recovery menu (Volume Buttons go up and down and Home is Select and Back is Back.) Select the following and in this order.

Wipe Cache Partition > Yes

Wipe Data / Factory Reset > Yes

Advanced > Wipe Battery Stats > Yes

Advanced > Wipe Dalvik Cache > Yes

Advanced > Fix Permissions > Yes

Reboot > Yes

This will then reboot your phone (On some ROM's it many not boot now but do not worry)

Download and extract the contents of an official stock GB update. [For the official Vodafone Online Upgrade to ICS choose the B885 or B892 firmware.]

[Guest portachking]

From the recovery menu (Volume Buttons go up and down and Home is Select and Back is Back.) Select the following and in this order.

Wipe Cache Partition > Yes

Wipe Data / Factory Reset > Yes

Advanced > Wipe Battery Stats > Yes

Advanced > Wipe Dalvik Cache > Yes

Advanced > Fix Permissions > Yes

Reboot > Yes

This will then reboot your phone (On some ROM's it many not boot now but do not worry)

Download and extract the contents of an official stock GB update. [For the official Vodafone Online Upgrade to ICS choose the B885 or B892 firmware.]

Thank you. You are just wonderful!

[Guest portachking]

Hmm, I'm having trouble resetting the IEMI to 0.

I've followed the guide several times to (downgrading from ICS to GB) and its still showing the original IEMI. Any suggestions?

[Guest 0066ad]

This downgrade should be updated, without all this middle update app and restoring imei, alot off people are

having problems with it.

There is none of this needed, it is very confusing.

The force downgrade is much easier no middle package and no imei hack,

and only takes two minutes

[Guest baluepauk]

My huawei g300 is with build no B880. I was tried to upgrade its firmware by OTA method.When I finished download its update file, I was installed it. But it was not upgraded .Why? What I need to do it again? Can I upgrade my phone with as your guide. Can I upgrade its current firmware to B 926 firmware? Help me.

[Guest b4da55]

This downgrade should be updated, without all this middle update app and restoring imei, alot off people are

having problems with it.

There is none of this needed, it is very confusing.

The force downgrade is much easier no middle package and no imei hack,

and only takes two minutes

How do you do this pls?

[Guest 0066ad]

How do you do this pls?

It is already on modaco look here

http://www.modaco.co...8/#entry2011243

Credits go to tcpaulh

Edited October 7, 2012 by 0066ad

[Guest tcpaulh]

Worth a try as it's less hassle but in some circumstances it will hang a third of the way through even with the middle file. If this happens then the zero imei method might be necessary.

[Guest 0066ad]

It worked for me with no problems, now back on atomicmod with overclock

my phone has never been better. Thanks tcpaulh and also tillaz for the great

rom it's a pity, it's is not in development anymore in my opinion it's the best

rom for this phone at the moment

Edited October 7, 2012 by 0066ad

[Guest tcpaulh]

:)

[Guest b4da55]

Already new about middle package which doesn't work. thought it was something i never heard about.

[Guest 0066ad]

I didn't use the middle package, just put b885 update app in the dfolder switched on holding vol +/-

two minutes after i had gingerbread back on my phone

[Guest b4da55]

It is already on modaco look here

http://www.modaco.co...8/#entry2011243

Credits go to tcpaulh

You said middle package not needed but that is where you linked me to

[Guest 0066ad]

I followed steps 1 to 5, i didn't need step 6 were is says use middle package

Downloaded b885 update app, put it in the dfolder on the root of my sd card

Turned off the phone, pulled the battery out for a couple of seconds, replaced

the battery and turned on phone with vol +/- pressed. till i got the pink bar on

my phone

After it was done hey presto, i'm back on gingerbread, the phone did boot loop

a couple off times but just like it did when upgrading to ics

Edited October 7, 2012 by 0066ad

[Guest b4da55]

Ok cool. What ics did you update from ie: what ics official update.app did you last flash before returning to gb and was it rooted cwm ect

Im on 926 which i came from 892 and most update.app fail. I was wondering if u flash 926 than 892 again will ut let me downgrade. Im thinking for futer official update. Also hsdpa 11 is a batt drainer.

[Guest 0066ad]

I done official update from atomicmod to ics b934. Then i rooted it and flashed favarooo ics

through cwm, I never really liked ics for me gingerbread runs alot smoother.

After doing the downgrade to b885 i couldn't get it rooted for some reason what i did was

put cwm and flashed a fresh atomicmod, now i have root, i didn't know i could flash cwm without

root but it worked, also flashed the overclock kernel for gingerbread

The phone has never been better than it is now

[Guest b4da55]

Ok thanks. Might give it a go next week sometime.