I have an X96 s905x running CoreELEC 19.2-Matrix_rc2.
Problem is : the box crashes consistently when transferring large files. This prevents updating widevine (which requires ~1GB chromeos recovery file).
This issue was reported by @tasinofan earlier, but no solution was mentioned. I was wondering if a solution might be in the pipeline. S905x emmc bootloader image (to try to fix large file transfert crash) - Help & Support / Installation & Booting - CoreELEC Forums
Tasinofan mentions it could be due to an error in the bootloader, however this is quiet new for me, so I could use some guidance to perform a fix in the bootloader.
My current workaround is restoring a kodi backup where Widevine was already installed.