Opfer0, If you have a backup of your 9.0.43 then you have a good chance of recovery but it all depends on how bad the upgrade goes. Sometimes you can find that you are left with a blue or black screen after upgrade but the player will still reconnect with your PC then you can just reload your backup without having to short your chip.
If the player is not recognised after the update then you need to short the memory chip which is the largest chip on your players mainboard to reset the player into recovery mode then you need to load a full version firmware followed by your dump file. This is not 100% though and you may need to try a few differrent full versions before you can load your dump. Do you want to go from vertical to horizontal or the other way?
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