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I would try to flash only the (unpatched) boot.img with fastboot: fastboot flash boot boot.img The original boot.img can be extracted from an ota.zip, either manually or by using free tools like these. While this should preserve your data, it's obviously recommended to backup your stuff first. Applies to any kind of flashing job, actually. 

It will wipe it, sorry. 

I have had Magisk on my Pro1X since I got it (as well as my Pro1 before that).  Sometime in the last year, while trying to get ChatGPT to like my phone, I tried several modules in Magisk and also tried hiding it.  When I hid it, it created a shortcut on the home screen.  Recently, I realized that shortcut was gone and I can no longer get into the Magisk app GUI.  The phone still appears to be rooted, but all attempts to reinstall Magisk and run it have failed. I've also tried removing all the Magisk modules through ADB and re-installing Magisk, but still no luck. I'm hoping that I can flash the OTA image for the Pro1X and then re-do the process of rooting the phone to get Magisk back.  I'm writing this to ask, as a sanity check, whether the instructions here:  https://community.fxtec.com/topic/3903-pro1-x-flashing-stock-android-in-fastbootd-mode-windowsmacoslinux/?_fromLogin=1&_fromLogout=1 will leave the data on my phone or if flashing the image will wipe photos and other files on the phone. Does anyone know for sure whether flashing the “2.1.2_ota_img.zip” with fastboot will be safe for data on the phone? Thanks, David

Strange as it may sound, the connection of fastboot is more picky than adb.  Usually an older pc, a usb hub or a Linux OS seems to fix it. I primarily see the issues with Windows pc with an USB3 port. I got the issue on mine too, but even a USB3 port on a thunderbolt docking works.  As an old tech guy it oozes of handshaking issues, that is a bug in the driver for Windows means it can not correctly handle if things goes too fast, and an usb2 port or a hub is enough overhead for handshaking to work...   

Lineage-22.2-20250922-NIGHTLY-pro1x with September 1st security patch installed smoothly via OTA. MindTheGapps15, and root was maintained.