Did you remove the Ldr.bin file from the Garmin\Updater\1091 folder before you tried to flash the TXT command with boot.rgn? BTW, you should have used the fail-safe conventional naming as anything else forces the flash, you've not read/understood kunix's post fully i think. Regardless, the progressive worsening of symptoms as you've described is quite indicative of a failing flash chip. It may now have finally died.