Yes Samsung cloud works because the ROM is a stock rom. By flashing twrp and rooting, no you don't lose your data at all. As soon as you have twrp, you can do a full backup before you dirty flash DevBase and you'll be set with all your data intact.
@VSiam - bit of a noob regarding flashing Samsungs, but I used to root and flash my old Oneplus One. Just wondering, with the fix you've suggested, does the phone need rooting and the bootloader unlocking etc?
Or can you extract the modem file from the firmware and install it to a stock phone?
I have ERD6 currently with ridiculous cell standby drain.
No unlocking boot loader etc. needed. Just extract the CP (modem) file from ROM package or download only CP and flash it with Odin.
So it seems that ERG2 firmware did not solve the problem. So we are back to square one... I don't wanna grizzle, but in my opinion Samsung plays cat and mouse with us :/
I noticed same bad smell also :/
Those that are still having drain issues even after the update, can you please go to About Phone -> Software Information, what does it read under Baseband Version? I'm running Oreo with the baseband version ending in ERG2 and no battery drain issues at all.
And now I just learned that a new bootloader (ERGE) and modem (ERGC) have been released. Downloading them and will flash soon.
Any news from you regarding drain issue?
Mine ends ERE8 on S7 Edge UK and have the problem. This is Oreo first OTA update in April.
Well, that's the problem. That's the old modem. You need ERG2 at least and which is a zip file you flash using TWRP. If your phone is pure stock, there's no way to do that. That's what's bothering everyone. The modding/xda community is able to update to the latest files which Samsung is not pushing to all its customers.
Stop messing with other's minds! This is incorrect information! You do NOT need TWRP to flash modem (CP), AP, bootloader (BL) and any other official ROM files or parts of it!!!