Hi everyone. I have PW3 with JB. All worked good, but I installed an update.
Now Kindle Launcher won't start, same as Vlasovsoft. But I can start my app (KOReader, Coolreader etc.) from KUAL menu. I'm not sure what was the FW before an update (may be 5.8.4 or so), but I remember I used a factory image 5.7.4 to downgrade and to install JB.
My Kindles SN starts: G090 G105 ........
Current FW: 5.9.7
May I use this instruction to downgrade my PW3 safely?
Is there any way to make a backup so I could roll back if downgrade fails?
Quote:
Originally Posted by coplate
Hi, I had upgraded to 5.8.9.2, and I wanted to downgrade back to 5.7.4 to test some more things. I did not want to flash over serial, so I found a change introduced in 5.8.9.2 that works.
Again, this only works if you are already jailbroken, and can SSH to your device, but it's any easy downgrade path, you are going to want to be in airplane mode because of step 4 and the note I put between 7 and 8.
1. enable usbnet
1. ssh to device
2. mntroot rw
3. touch /PRE_GM_DEBUGGING_FEATURES_ENABLED__REMOVE_AT_GMC
4. disable usbnet
5. plug in device and copy initial factory firmware from SW jailbreak thread.
6. eject
7. settings->update kindle
Now I am back on 5.7.4, but I have not reset my kindle, and I still have that
/PRE_GM_DEBUGGING_FEATURES_ENABLED__REMOVE_AT_GMC, also, now there is a new entry on my home screen called "Kindle Feedback" with a chat icon on it, I don't think it's a good Idea to click that.
I might be able to skip # 8-10, but no instructions talked about doing a reset on the factory firmware, and I didn't think it was a good idea.
8. update to 5.8.1
9. System menu reset
10. downgrade back to 5.7.4
Now I have done steps 1-4 of the main jailbreak thread, I can start over with actually jailbreaking again.
Main jailbreak thread for reference:
https://www.mobileread.com/forums/sh...d.php?t=275877 |