Just letting you know my experience on this. I'm running a G930FD with the Vodafone NZ firmware (VNZ), with the cell standby battery drain issue. I flashed the bootloader and modem from earlier in this thread (EREO) and this fixed the cell standby issue, but I had similar battery life overall due to Google play services battery drain. This also caused the device status to be detected as custom, and android pay, Samsung health etc. would not work. I flashed back to the VNZ bootloader and modem and the Google play services drain is fixed, but the cell standby issue came back. Device status is back to official now though. I will try just flashing the EREO modem (not the bootloader this time) and checking what difference that makes. Either way, so far the battery life is worse on Oreo compared to Nougat regardless of firmware.
... View more