Oooooh... I tried it, downgraded it, did the jailbreak, I was so happy, and when it tried to upgrade, well...
Your Kindle Needs Repair.
Please contact Kindle Customer Service at
http://kindle.com/support
Repair Code:2
Version:2588930001
DSN:90D422... (...)
Tried the DO_FACTORY_RESTORE (successfully putting the file in the root directory), and nothing happened.
I'm so very sad...
I've seen this thread:
https://www.mobileread.com/forums/sho...81&postcount=1
It seems like I'm out of luck...