How I fixed fastboot after Magisk update

After updating Magisk to v26.3 using the App (direct flash method), my phone only booted into the fastboot mode.

I fixed this by **re-flashing the current Magisk (v26.3) using TWRP recovery.**In order to do this, I needed to rename the Magisk APK to .zip (else TWRP 3.7.0 won’t recognize it). Then I flashed it, which only took a couple of seconds. After that, the phone booted normally again.