firmware: DS918+ 6.2.4, redpill-6.2.4.
Hardware: Lenovo M93p (i5 4gen, one SSD drive) - this is only for test.
first try: turn off nas, replace flashdrive with redpill-7.0, turn on nas. Result: nas is not available, no ping, empty list in synology assistant
second try: from DSM 6.2.4 i run manually update to 7.0-41890. NAS has been restarted (still runned on redpil-6.2.4) goes to recovery state. Tried to continue recovery, NAS restarted but still was in recovery mode. So i replace loader to redpill-7.0 and run recovery once again but after few second i back to recovery main page.
I`m testing and trying to figure out a working procedure to upgrade Xpenology from 6.2.3 to 7.0 before i will do this on my prime NAS.