I’m having some trouble with one of my Rock Pi 4’s, it’s not booting Android and doesn’t have a HDMI signal… but I do get both the LED’s and a solid blue.
I initially thought it may have been an adapter issue, but I used an Anker QC 3.0 power adapter… and it doesn’t work. I have another Rock Pi 4, which can run Android just fine using the same power adapter.
I think I may have messed something up when I was trying to get a build of CentOS running on it… so I’m not sure how to fix it, or if this was the actual cause. But when I try Ubuntu Server or the Debian stretch image… it works fine. I’m using eMMC modules. If anyone can help shed some light, I’d appreciate it greatly. Thanks!
After tinkering around for a few hours, I’ve found the reason to be part of the SPI flash. After I connecting pins 25 and 26 together, put on the eMMC and then start up the Rock Pi… it worked in booting Android from eMMC.
I have did the SPI bootloader update while on Debian stretch, not sure if this may have anything to do with it.
After I get my USB A to USB A… I’ll look into the SPI thingy some more and report back. At the moment, I still can’t boot specifically Android or Android TV without connecting the 2 pins together.