Our server directly accepts files with extensions apk; bmp; cab; deb; doc; jar; jpeg; jpg; pdf; png; sis; sisx; and txt. Any other type of file or a folder must be compressed to an archive in rar or zip format as those 2 types are also accepted.

I've downloaded your XML file, the first thing of note is this:
Model>
<PartNumber>006-B1562-00</PartNumber>
<SoftwareVersion>770</SoftwareVersion>
<Description>Alpha 100</Description>
</Model>

Of course there's been a lot of flashing attempts since you made that backup, so it's unlikely V7.70 is onboard now, almost certainly it's V3.00 cure fw but i'd have liked to know for sure. What's noteworthy is that you firstly updated with GE to V7.80 and since then have flashed with V3.00 as cure fw so i do wonder why 7.70 shows on the XML from the backup. It would be better knowing 100% what's loaded now which is why i was hoping that the XML file had been recreated on a recent boot attempt however i'm going with it's V3 as a likely bet and used the boot.bin componenent of it to make Ldr.bin for this attempt.

So let's see what we can get off it now with a media card. Please read the disclaimer below before you go ahead, this isn't without risk but is normally quite safe to do. Behind a spoiler below i've attached a file for you to use, in it are text commands to dump copies of the device's various regions. Extract "Copy_To_Card.zip" directly onto a clean microSD of at least 4GB size formatted FAT32 then follow this:
  • Ensure the battery is fully charged
  • When charged, ensure it's FULLY OFF, even if you have to force it off by holding the power button down for a while
  • Place the card in the Alpha
  • Power it back on and wait
  • "Loader" or "Software Loading" or a similar message should show on the screen
  • Don't touch any buttons or interfere with it until it finishes, you'll know it has when it tries to re-boot but sticks on the start screen
  • Turn it off again and remove the card

Spoiler:
[Only registered and activated users can see links. ]

Connect the card to your PC and examine the contents, hopefully there'll be numerous BIN files in the root alongside the Garmin folder, many will have 0 bytes however. In Garmin\Updater\1562 folder there should be 2 new files named "last_id.bin" and "update.log". Please compress them into a RAR or ZIP and post the archive file here.

Disclaimer: All flashing carries some risk. Although a certain procedure may be quite safe in a healthy device, it can have adverse effects in some devices which are affected by previous failed or inappropriate software flashings. All possible care has been taken in compiling the flash files however all and any risk is carried by you, the end-user.