Hi
I faced a similar problem but for a PW3 about a month ago. After some failed attempts, I used winterbreak to start anew. Once 5.14 installed, I did winterbreak. Later I added the latest devCerts which, I have been told, are valid till... 2099. Initially my PW3 was running the antiquated 5.7. version...
To see if winter break can be used on your machine depends on which Kindle version you are running now and if you are still below the WB compliant firmware version of 5.12.2.2. (for PW2).
https://kindlemodding.org/firmware-a...g-updates.html