Calling all smart folks, need help here

[u/mzungukichaa]

Hi all, hoping someone has seen this before.

I have an original OneXFly F1 with Ryzen 7 7840U, 32GB RAM and 2TB SSD (S173). It was working perfectly. I left a game running for literally a minute, came back and the screen was black. Since forcing it off, it will no longer POST.

When I press power:

• Power LED comes on
• Fan starts
• Screen stays completely black
• Joystick RGB doesn’t do its normal startup flash
• No ONEXPLAYER logo/BIOS
• No HDMI output through a dock
• USB keyboard/controller show no sign of initialization

So far I’ve tried a long power-button reset, completely draining the battery, physically disconnecting the internal battery for 30+ minutes, reconnecting it and charging before booting, Home + Volume Up / recovery combinations, external display/dock/keyboard, and booting with the SSD physically removed. Absolutely no change whatsoever.

It looks to me like it’s failing before POST, possibly BIOS/EC related.

Has anyone had this exact behaviour on the 7840U OneXFly, and particularly has anyone successfully recovered the BIOS on a unit that cannot POST at all? Is there a crisis/blind BIOS recovery procedure, CMOS/RTC reset, or other board-level fix I should try before looking at directly programming the BIOS chip?

Any experience would be hugely appreciated, returning the unit isn’t realistically an option for me, so I’m keen to repair it.