
Welp i tried
On pw2 firmware 5.10.2.1 i got into demo mode went to side load created and added files as per instruction, nothing happened.
So i tried to sideload -> done again nothing

. I thought(most likely not) I succeeded at that point but was unable to access settings and encountered "kindle application error could not be started" hard reset didn't help.
I request help from any and every kind soul on this tread.
Edit : issue old firmware solution update firware
PS: it works yay