Downgrading from JB to ICS
-STILL HAS SIGNAL PROBLEMS-
Hi guys. Im not exactly new but i think this is my first post, cos usually i don't have anything interesting to post.
Bit of backstory:
Had a razr i for a few months. Upgraded to JB, hated the removal of sleep mode and the pervasive fuzziness to it all (ics just seems much more crisp to me) and so decided to downgrade. Assumed peoples of xda had it figured out, ended up with complete refusal to connect to any mobile networks about an hour after boot, which meant i had to restart a lot, which meant crappy batt life. Tried to upgrade back to JB, bricked and dead. Is now a useful and attractive paperweight.
Bought another, fully intending to keep it on ics. Experienced some issues with software bugs, figured they would be sorted in JB, which they were. However, missed ICS. Searched youtube for a decent way to downgrade, found a video describing how to downgrade with a different method than i have seen anywhere on xda - editing xml file in the fastboot files, and then using rsd lite. Looked safe, tried, now rocking fully working ics exactly as it was when i bought it, save for now having an unlocked bootloader.
Title of video is Downgrade RAZR I XT890 do JB (4.1.2) para ICS (4.0.4)
(cannot link, technically new member lol)
Some instructions, because the video goes on unnecessarily :
Get the fastboot files (it says and links to brazil in vid, but i used GB Orange, which my phone came with, and it worked fine)
Edit xml with notepad++ as follows
Delete line with getvar max-download (My rom didnt have this line anyway)
Delete line that mentions flashing gpt
delete line that mentions flashing motoboot
(Guy turns back into zip, but is unneeded)
Open xml with RSD lite
Install in fastboot
Try at your own risk, can only say that this suggests only gpt and/or motoboot are the files that affect the service required code corrupt message (which i got on my first razr i, with and without using the unbrick files on xda)
I dont understand any of what the guy is saying, but if you need to see it in action, the vid is on youtube, shows it very well and gets points clearly across
This is just about the only place i can post this so yeah
glhf, i take no credit or responsibility, i am but a wandering do-gooder and whatnot