HP Prime bricked after update

[XY0797]

(06-22-2021 03:12 PM)Claudio L. Wrote:  

(06-22-2021 09:45 AM)XY0797 Wrote:  About how I came to this conjecture:
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If your calculator was updated to the latest recovery version before the "failed" flashing procedure, as far as I know it will skip over bad blocks when writing the firmware, so your calculator should still work. The flash chip is made by Samsung, not exactly rookies in the flash business so your quality control assumption seems baseless.
All flash chips have and develop more bad blocks as they age. The firmware should be able to handle bad blocks without crashing.
As another theory, there could've been a software crash that randomly erased some blocks, preventing Recovery from loading, that's extremely rare but it could be possible.
Other hardware failure is much more likely (a blown capacitor, resistor, etc.), that could prevent the flash chip, the CPU or other unrelated hardware from working, hanging your calculator.
You said it was recognized via USB for 3 days after the flash, so flashing was unlikely to be the cause. I think you won't know until you connect it via JTAG. If it was indeed an erased block problem, you'll be able to write the new recovery and bring it back to life.

You still don't seem to understand what I mean. I mean: the calculator will work properly after firmware updates, and flash memory is good at this time, but three days after firmware updates, the new firmware failed to bypass the bad flash memory blocks and write data that caused the damage to the flash memory.
The day before the new firmware corrupted flash memory, I successfully connected to the computer using USB. At that time, I didn't know the calculator would be corrupted tomorrow. I just did a normal data backup.The new firmware then damaged the flash memory without warning during normal use.The new firmware can be connected normally by USB before, but it can not be connected after the accident, so screen problems can be excluded.