x230: Trying to boot from USB does nothing, returns to menu

[dcht00]

It just blinks for a split second, and returns straight to the boot options menu.
Tried different USB keys, ports ... No luck.
Fully charged original battery.

My current bios is G2ETB3WW (2.73), EC 1.14.
Running "legacy first" mode, ...

--------------------- iso report
Based on code from: x230 BIOS 2.75 (G2ETB5WW) EC 1.14 (G2HT35WW)
Buildinfo: v1-435-g1047da (20230927) patched.x230.iso
Built FL2: 611c88f62add31aa4cdbedeec50e9583af509cbe x230.G2HT35WW.s01D3000.FL2

Patches applied:
x230.G2HT35WW.img.d/006_battery_validate.patch

--------------------- generating USB
$ sudo dd if=patched.x230.iso of=/dev/sdc bs=4M status=progress conv=fsync
8+1 records in
8+1 records out
33927168 bytes (34 MB, 32 MiB) copied, 1.71633 s, 19.8 MB/s

[chugu]

this may happen if your boot mode is set to uefi only and the usb key is not uefi. does the usb boot any other pc if you try? its either usb or boot mode (uefi), you may want to try other boot modes (legacy only) and see if it works.

this exact thing happened when i had the boot mode set to uefi