Many moons ago, I bought refurbished Kindle Paperwhite from Aliexpress. I installed Jailbreak, Collection Manager and Kual with few goodies, like KOReader, BBB firewall, Back Door Lock...
But Amazon soon blacklisted my device, because it have some generic serial number. And i give up with software updates, and use Kindle just for reading - blasphemy, I know
So, what i need to do now, after many years, to update software (any) to new versions? I presume firmware is out of the question, but what about KOReader and other apps from Kual? Just to copy new version to /extensions folder and overwrite old one?
My firmware is 5.3.1