[REQUEST] ThinkPad E15 Gen 2 - BIOS Update Stuck 0% Battery - Seeking Bypass Winflash

[Ronin314Clear]

Hello everyone,

I'm seeking assistance with a critical BIOS/PD FW update issue on my Lenovo ThinkPad E15 Gen 2 (MTM: 20TES0X100). The battery is at 0% and won't charge due to a known firmware problem with the USB-C port. Lenovo released a critical BIOS/PD FW update designed to fix this issue, but the update process is stuck in a Catch-22: I can't apply the update without a charged battery. My laptop is connected to stable AC power via a UPS.

My current BIOS version is R1EET31W (1.31).

I've downloaded the update from Lenovo's official site: https://pcsupport.lenovo.com/ag/en/produ...d-e15-gen2

I've attempted a manual update using the winflash64.exe utility that comes with the update package.

Attempt: /cbp 0 switch and Pre-Boot Failure

I tried running winflash64.exe with the /cbp 0 switch (documented in WinFlash64's general help). The command I ran from an elevated prompt was:

winflash64.exe /ipf bios ec /file $xxxxxxx.FL1 /cbp 0

(where $xxxxxxx.FL1 is the name of the BIOS file included with Lenovo's update).

The winflash64 command itself completed and the machine rebooted to initiate the update. However, the actual BIOS upgrade process was then aborted with the error message: "Check power failure, please insert the power source or charge the battery". This indicates that despite the cbp switch, a hard-coded override (or a pre-boot check) prevented the update from proceeding due to the 0% battery.

This "power failure" message made me wonder about the /cac option (AC power check) in WinFlash64's general help. Even with AC via UPS, could this "AC check" also be an issue that needs bypassing?

Any suggestions on how to force the update would be greatly appreciated. Specifically, if anyone in the community could point me towards an older winflash64 version (or similar flashing utility) still supporting the cbp (or cac) switch that is hopefully compatible with my ThinkPad E15 Gen 2, that would be awesome. I'm also open to other methods, such as modifying the update package or direct ROM flashing, if feasible.

Thank you for your time and expertise!