Hi I just want to share my experience with 927 upgrades.
For some unknown reason I wasn't able to upgrade/downgrade from 885. Neither with Huawei Middle Package nor with the IMEI hack. Tried lot of combinations, nothing working. Always the ram error message.
I then tried with the fastboot method and despite being able to flash, nothing, the phone was stuck on Huawei logo. So I reverted to the Clockwork backup I did just before the fastboot try, the same not working situation as before.
After that I retried with Huawei Middle Package, followed by 882 and this time, unexpectedly it worked!
After that I booted in 882 and then, rebooted with volume up + down and now I was able to install 927 !
I have no idea what my problem was but actually, just retrying it worked.
Thanks to Hans Gruber for some suggestion via pvt.