@OndrejCZE
Try this Mod BIOS and see if CSM options show in boot tab section.
I also made a few USB changes too, so maybe USB boot device will work for you now, fingers crossed
https://nofile.io/f/03mC2hcvRy8/GLKM1.M2.zip

I did notice that it looks like if you use UEFI secure mode (password locked with keys I think), then CSM cannot be used.
I am not sure about all that though, have never used secure modes so I'm not certain how all that applies.

Thank you for moding the bios. But it killed my motherboard :-D see. the enclosed video.
I apologize for the video being turned.

@OndrejCZE
So sorry that happened! You don't have to do warranty RMA, you can buy programmer on ebay for $3-5 (SPI flash programmer CH341A) and reprogram the chip with stock BIOS, it's very easy to do and only takes 1-2 minutes

I see press F2 or Del to enter BIOS (Not space key, looks like you press space due to it saying "Pause pressed"), did you try that yet F2 or Del? I hear you press key, not sure which though.
If you can get in there you may be able to reflash stock BIOS. Same for DOS, if you can boot to DOS vis USB or CD then you can reflash with AFUDOS or the Asrock DOS flasher.

If you can get to a "Boot Menu" via F11 at startup I'm certain it can be recovered via DOS flash!

It doesn't look as bricked to me as you might think, you may be able to reflash via BIOS if you can get in or should be able to via DOS, without having to wait on a flash programmer

Any progress on this? I have same model, and i can't pxe boot because it doesn't support Legacy boot..
I wouldn't mind testing custom bios as long as there's a clear reflash instructions in case things go wrong

What board @cemara ? Please link BIOS from manufacturer and I will check for you.

It's similar to OndrejCZE's board, Asrock J4105B,
https://www.asrock.com/mb/Intel/J4105B-ITX/index.us.asp
No legacy boot seems to be a common issue to gemini lake boards,
and it's intel's decision to ditch legacy,

Here is first test (only enabled main menu entry) @cemara - if contents inside missing let me know (didn't want to double enable if already enabled when root submenu is enabled)
Should be new submenu located at Boot >> Boot >> CMS at bottom of page, directly under Boot Beep, then Full Screen logo or Addon Rom Display (If not, show me image of this page)
If settings are visible you should see these 4 options inside submenu, if not let me know and show image

http://s000.tinyupload.com/index.php?fil...186358573443295

Its late here so can take pic like 12 hours from now..
But i'm sure theres no CSM or anything to flip uefi to legacy on boot submenu.. its similar to the ones posted by OP in previous page..
Is it intentionally hidden by asrock ?

@cemara - You are talking about after you flashed the BIOS above I sent correct? You don't see submenu named >> CSM(Compatibility Support Module) at bottom of boot page, under Full Screen Logo Option?

Yes, they intentionally hide, but we can unhide, sometimes take a few tries using different methods. And, even if we can never unhide, I can either change the default settings for you, or show you how to do it without BIOS flash, but I bet we can unhide

Ah so that link is bios file, i thought its screenshot file,
I will flash it tomorrow, thanks. The current bios is the same as the ones posted by OP on previous page.

Ohh, sorry for any confusion! Yes, that is a modified BIOS I linked above, then showed image of the settings you should see or not inside " CSM(Compatibility Support Module)" submenu
I'm not sure if same BIOS as previous ones, I downloaded the latest 1.30 it was I think

Hmm strange i cant seem to download it, can you use other file sharing? google drive maybe?
Edit : had to use vpn..
I just flashed it using instruction on asrock website, but now i cant even turn on the board.. is it dead?

Very sorry to hear this @cemara !! What is the MD5 checksum value for the file you used to flash with? Concerned maybe VPN and issues downloading corrupted a byte or something possibly? I get this for file I sent >> MD5 9d3303cf4a9d0b6d04f126e41c40249d
It could be a faulty mod, but I doubt that since I didn't edit much at all (only moved 4 bytes) and removed Asrock's Protection via UBU. Or could have just been a bad flash?

If you can't get it running, you'll have to order a CH341A flash programmer, or other similar. And a SOIC8 test clip cable, or SPI Cables, BIOS is right above the CMOS battery
These are only about $2.50 each on ebay but 3-5 weeks for delivery, same $ for the SOIC8 test clip cable, let me know if you need links.
Or a kit like EZP2010 or EZP2013 would work as well, or any other hardware flash programming kit that has cables and flashes 25xx type BIOS. You can get all these on ebay, or places like Newegg Amazon too for higher price/faster shipping.

*Edit - @cemara I noticed this on 1.30 BIOS - the update ME/TXE notice - if you were not already on that 1.30 BIOS, you may need to do this now, see if that let's it startup, if so then you will need to follow the rest and update the ME/TXE using the stock BIOS files.
https://www.asrock.com/support/BIOSIG.asp?cat=Windows10

Then you may need to reflash the MOD BIOS again using built in BIOS flashing app

Zitat von Lost_N_BIOS im Beitrag #28

---

Very sorry to hear this @cemara !! What is the MD5 checksum value for the file you used to flash with? Concerned maybe VPN and issues downloading corrupted a byte or something possibly? I get this for file I sent >> MD5 9d3303cf4a9d0b6d04f126e41c40249d
It could be a faulty mod, but I doubt that since I didn't edit much at all (only moved 4 bytes) and removed Asrock's Protection via UBU. Or could have just been a bad flash?

If you can't get it running, you'll have to order a CH341A flash programmer, or other similar. And a SOIC8 test clip cable, or SPI Cables, BIOS is right above the CMOS battery
These are only about $2.50 each on ebay but 3-5 weeks for delivery, same $ for the SOIC8 test clip cable, let me know if you need links.
Or a kit like EZP2010 or EZP2013 would work as well, or any other hardware flash programming kit that has cables and flashes 25xx type BIOS. You can get all these on ebay, or places like Newegg Amazon too for higher price/faster shipping.

*Edit - @cemara I noticed this on 1.30 BIOS - the update ME/TXE notice - if you were not already on that 1.30 BIOS, you may need to do this now, see if that let's it startup, if so then you will need to follow the rest and update the ME/TXE using the stock BIOS files.
https://www.asrock.com/support/BIOSIG.asp?cat=Windows10

Then you may need to reflash the MOD BIOS again using built in BIOS flashing app

---

@cemara - Great you could find a programmer locally. Did you get cables? you need either SOIC8 Test clip with cables, or SPI Cables for your BIOS since it's not socketed.

That is not same MD5 checksum as file I uploaded, so something must have happened to it during the VPN download possibly?
I re-downloaded from the link I gave you again just now to confirm the MD5 from file I had in storage that I gave you previously, it's a match


MD5 = 9d3303cf4a9d0b6d04f126e41c40249d

Even though MD5 does not match, you did remove the jumper after flashing now correct? I assume this wont help, since MD5 does not match who knows how bad the file is you flashed in? Very sorry this happened, but looks like it's due to how you had to download.
Upload that file you have and I will check it, maybe I can find what the issue is, but you wont be able to fix it without a programmer, unless you can boot to DOS?

If you have not tried yet, put jumper back on and see if you can boot to DOS or BIOS like that, this will disable the ME region if ME region is what got messed up during the flash you may be able to reflash again.
If you do get lucky and that gets it started again, redownload the file and make sure you get that MD5 above before you flash it. And if needed, please give me a free file host other than google you want the file uploaded to and I can re-upload for you.