Hello experts,
I am experiencing a severe Firmware Deadlock on my Clevo NH50_70RC (rebranded as Casper Excalibur G770). After an installation attempt of CachyOS (Arch-based), the system has become stuck in a boot hang state.
The Issue:
Logo Hang: When any drive (SSD/HDD) containing Linux partitions is connected, the system hangs indefinitely at the manufacturer logo. I cannot access BIOS (F2) or the Boot Menu (F7) in this state.
The Cause: It appears the InsydeH2O firmware is panicking while parsing the UEFI boot entries or the GPT partition table of the Linux drives.
Current State: I can only boot into a USB installer if I physically remove all internal drives. However, hot-swapping them back in once the OS is loaded does not trigger a rescan at the controller level, leaving the drives invisible and preventing any wipe/recovery attempts.
Technical Assets & Verified Specs:
I have obtained a Full 16MB SPI Dump and verified the following specs from the BIOS Main menu:
Chassis / Project Name: Clevo NH50_70RC
BIOS Version: 1.07.03 (Insyde Corp. 5.23.04)
KBC/EC Version: 1.07.03
ME FW Version: 12.0.38.1430
Processor: Intel Core i7-9750H
Secure Boot Status: Currently Disabled
Dump Details: Includes Flash Descriptor, Intel ME region ($FPT at 0x2000), and the BIOS region with $VSS signatures.
My Request:
Unlock Advanced/Chipset Menus: I need access to the hidden “Advanced” and “Power” tabs to modify SATA/VMD modes and potentially bypass this boot hang.
NVRAM Cleanup: I suspect the NVRAM ($VSS region) is cluttered with invalid boot entries causing the EFI parser to hang. I need the NVRAM region in this dump to be cleaned or reset to factory defaults.
SPI Dump Link: SPI Dump (Google Drive)
VirusTotal Scan: VirusTotal Scan
I have the means to flash this back if I can get the system stable or via an external programmer if necessary. Any help from the BIOS modding community would be greatly appreciated.
Although this is a modding request for unlocking and NVRAM cleaning, the ultimate goal is to resolve a storage-induced firmware hang that prevents any drive recovery on this machine.
Best regards,
HISATO
