Installation on Raspberry Pi 4 (4GB) with SDCARD gets stuck on rainbow splash

[cho2]

Can't Boot Endless 3.8.4 on Raspberry Pi 4

There is a problem found with Raspberry Pi 4 Model B Rev 1.1 which causing RPi4 stuck at booting. And the workaround is to add a line in config.txt file under boot partition(FAT, ~105MB): enable_uart=1 This method only needed for flashing a brand new 3.8.5 image, also the problem is reporting to the engineering team, the fix will be included in the next 3.8.6 release.