Hello, I'm a repairman, don't meddle much with Macs. I received a Macbook Air 2017 from a client who wanted to update it to a newer macOS version, did the update to Sequoia using OCLP, after a couple tries everything went fine and I installed root patches etc. Tested fine and gave it back to the client. A couple of weeks later, he says his keyboard doesn't seem to be working (sent a video on the lockscreen where he tries to type and it doesn't register on the password box). Touchpad seems fine and the kb backlight is on, if that's of any importance.
Any idea what could cause this? He'll bring it back if needed, just trying to spare him of doing that if it's a reasonably simple software fix

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