That's still not completely clear what HWID might have been written to it. The device will only read from the folder named the same as its ACTUAL HWID which may still be 2267 but it's had the ramloader from dezl 580 used last it seems. You've also used, perhaps unsuccessfully, DS51's ramloader at some point. The last successfully flashed ramloader may have changed the HWID of the device, at least as far as the bootloader and x-loader in regions 5 and 43 are concerned.

The goal here is to flash complete DS50 firmware back to it and ensure it again has HWID 2267 in all it's relevant regions, so do this:
Prepare a clean microSD card and extract this RAR file to its root, [Only registered and activated users can see links. ]. In the usual Garmin\Updater loaction, you will have a folder 2267 with Ldr.bin (ramloader from DS50) and update.txt. In the card's root along with the Garmin folder there'll be 14.bin, 127.bin and 158.bin (all other firmware components for DS50). Now make two copies of the 2267 folder and paste them into the Updater folder, Windows File Explorer will auto-name them "2267 - Copy" and "2267 - Copy(2)". Re-name one to 2586 and the other to 2826. You should now have 3 folders each with the exact same content named 2267, 2586 and 2826 in the Updater folder. Place the card into the device and start it, it will hopefully read one of the folders and flash itself back to normal DS50. Note that it may also kill it completely so the risk is entirely yours!