This is the best summary I could come up with:

According to the Asahi team, the bugs lurk in the upgrade and boot process and, when combined, can create a condition where a machine always boots to a black screen, and a Device Firmware Update (DFU) recovery is needed.

While this might sound alarming, the team was at pains to assure users that data was not at risk and only certain versions of macOS were affected – Sonoma 14.0+ and Ventura 13.6+.

The first bug is related to macOS Sonoma using the previously installed version as System Recovery, which can cause problems when an older RecoveryOS runs into newer firmware.

It will also perform an integrity check to verify the status of the System Recovery partition before making any changes.

The team noted: "Even users with just 13.6 installed single-boot are affected by this issue (no Asahi Linux needed).

"We do not understand how Apple managed to release an OS update that, when upgraded to normally, leaves machines unbootable if their display refresh rate is not the default.

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