Well, it's difficult to know for sure that it made no difference because the device has Cure firmware loaded and cure fw isn't meant to boot in fact it's intentionally made so it doesn't boot the device fully.
Knowing that the Alpha can't read from the card isn't totally unexpected however given what's happened to it. It simply isn't getting far enough into the boot process to execute Ldr.bin in the 1562 folder.
Let's try with a modified boot.bin as RGN flashed in preboot to run the txt commands:
- Remove Ldr.bin from the 1562 folder of the microSD card (very important), leave only Update.txt file in the 1562 folder.
- Insert the card into the Alpha and ensure it's off with the battery charged.
- Behind the spoiler below is 156201000300.zip, extract it to find 156201000300.rgn and save it somewhere convenient on your PC, the desktop is fine.
- Open the RGN in Updater.exe and leave it's GUI open and visible with the radio button next to 'USB Device' enabled.
- Plug a 'known-good' USB cable directly into a rear USB2 port of the PC. Put Alpha in preboot and immediately connect the USB cable to it and when you see the device details in GUI's window very quickly press 'OK' or just hit 'Enter' key on PC's keyboard.
When 'Loader' appears on screen you should be ok to release the button, or for safety hold it until the device tries to re-boot signalling the end of data transfer to the card. Hopefully it holds preboot long enough to initiate Update.txt.
Spoiler:
This method doesn't rely on the device fw initiating to start Ldr.bin so it is more likely to work to dump region contents. Good luck!
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