Lenovo M900 Tiny Bricked

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That’s looks like a stock bios region. If this doesn’t work you might try to clean the ME according to

[Guide] Clean Dumped Intel Engine (CS)ME/(CS)TXE Regions with Data Initialization

Guide-How To: Clean Dumped Intel Engine (CS)ME/(CS)TXE Regions with Data Initialization Last Updated: 2020-07-22 This guide is relevant to those who need to clean the DATA section of an Engine (CSME, ME, CSTXE, TXE) Region, which is part of a dumped SPI/BIOS image, in order to flash the latter on a different machine of the same OEM model. It is not meant as a guide on how to completely transform a dumped Engine region into a stock Intel-provided one. Although the guide can be used for that some…

If you can confirm valid good flashing of the chip and it still doesn’t work it’s not related to UEFI firmware.