Please use this thread for general 19.1-Matrix_rc4 discussion
Please be sure you have a file
/flash/dtb.img on your current eMMC installation before upgrade to CoreELEC-19-Matrix! Otherwise the device will stop booting and a recovery will be needed!
Open a SSH connection and check it by:
CoreELEC:~ # ls /flash/dtb.img /flash/dtb.img
If the output look like this the system is compatible and can be upgraded to CoreELEC-19-Matrix. If you get a “file not found” please restore your system like with a Android image or a compatible krescue image before upgrade! Please keep in mind the VIM3L HTPC kit is including a not official image by Team CoreELEC so maybe it does not support the upgrade as well.