DO NOT upgrade your BIOS from FEB 2017 onward. It will stop you setting a distance less than 25m in the scope and screw most air gunners up.

If you have already done it and want to downgrade, then follow these instructions

1. Get this file https://www.dropbox.com/s/p7ds3muqvvn... for the Version 2.1.104.619 BIOS before the FEb 2017 update

2. Rename it to 2.1.08.748 and copy to SD Card

3. Write down all your xsight settings

4. Insert the SD Card and reboot to force upgrade or should I say downgrade (may take a few reboots)

5. Reboot and keep rebooting and check system info to see if it worked as it should say the 619 version in the scope and you can now set distance below 25m

Or try this method recommended by one of my subscribers.

Phil Willis said
Hi Steve. There is another way to downgrade the fw updates to any previous version. For xsight xsight2 and Thor/Mars simply rename the update as follows.
xsightxsight.bin
xsight II xight2.bin
Thor/Mars thorhd.bin
This came direct from atn for the ability to revert to previous fw.

Good luck

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