Couldn't wait and took the plunge this morning, got stuck on the verification for a while to which I s*** myself.
BUT I waited and.........all is good 😃
It looks well, found a couple of niggles but so far so good.
I'm actually replying to you on it now and its managed that too!
You don't need to change CSCs, XEF is included in OXM, so you should be able to just flash the latest BTU with HOME_CSC and then update.zip from recovery
All CSCs included in OXM:
ACR AFG AFR ARO ATO AUT BGL BNG BRI BTC BTU CAC CAM CHO COO DBT DKR ECT EGY EON ETL EUR GLB ILO INS ITV KSA LAO LUX LYS MID MM1 MWD MYM NEE NPL ORX PAK PHE PHN ROM SEB SEE SEK SER SIN SKZ SLK SMA STH THL THR TMC TPA TPH TTT TUN TUR WTL XEF XEH XEO XEU XFE XME XSG XSP XTC XXV ZTO
Eventually figured it out. My sd card was encrypted and it couldn't verify the signature.. Will give it a go now for a bit. Bit buggy here and there. But liveable .
I'm uncharacteristically being patient.
Saying that, still checking the app on a daily basis even though I know I'll be notified.
I also have the notification turned on, but got no notification when the beta started for my German device.