Take battery out, wait 5 minutes, put in SD with firmware, put back battery, turn on and "pray"
That always recovered device if problem was in software (any kind).
But it could not solve hardware problems.
Good luck!
All these devices are known for overheating in work.
I have one PN4000 and one PN6000 with defective memory, waiting to end up in trash (and soon they will).
No help for them.
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