I find it super funny how Samsung is asking $1,000+ for the Note9 and how the S7-8-9 were $600-800 dollar phones, yet it seems that it's going to take them 20 updates and 6 months later to fix a battery drain problem that's so bad people need to carry their chargers with them at all times. If that's what's going to happen to the Note9 and S8-9 when they get Android P, then I just feel super bad for the people that spent this kind of money for the phone. It's very weird how some of us have the problem and some don't, but nonetheless, that's where manufacturers should stand behind their products and customers.   I'm still using the stock-based custom ROM called DevBase from XDA with the ERG2 base, ERG2 modem, and July patch and getting amazing battery life both on LTE and Wi-Fi in idle and during use. ... View more

With LTE ON and AOD OFF, I get 1.3%/he drain at idle at night using the xda DevBase stock ROM by Alexndr using the ERG2 modem. ... View more

@SmashMix wrote: You rooted stock Nougat before flashing Oreo. Did the rooting process wipe the data? If I got you right you managed to keep all your data in whole process all the way from stock Nougat -> flashing TWRP -> rooting it -> dirtyflashing DevBase? My phone had been rooted and with TWRP since Marshmallow so I can't really remember 100% but i don't recall losing data when rooting or installing twrp. You only lose data when you actually wipe it inside TWRP. ... View more

@SmashMix wrote: Wait a minute.. What? I will paste the dev's own answer: My question: Originally Posted by   smashmix   This ROM have to be flashed only using custom recovery, if I got it right. I have one question then. I have now stock Oreo with stock recovery without root (Knox is ticked because I was playing with custom recovery and root before). If I flash now TWRP (on top of stock Oreo using Odin) to flash this ROM will I loose my data? Same thing asked differently: will flashing TWRP wipe my data?   I'm planning to dirty flash this ROM over the stock one. Answer from _alexndr In your case your device will not boot even in if you just flash TWRP over stock ROM without other actions (even without rooting!) - that's why you need already rooted stock ROM with TWRP already installed to make it possible to dirty flash DevBase over stock ROM Do I have to believe you or dev I really don't want to loose my data.. again.. sick and tired of setting everything up from scratch In this case, obvisouly believe the dev but how can one get a stock rom with twrp installed and root if they don't flash twrp first and then flash the zip file to root it using twrp or odin?   Before this DevBase rom, i was running stock Nougat which i rooted using twrp and then dirty flashed DevBase on top.   I suggest you reask alexndr to get more info. ... View more

@SmashMix wrote 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!!! You're right. I haven't used ODIN in years to flash bootloaders and modems, etc.... that I didn't think about it so to clarify either TWRP or ODIN can be used to flash these files. ... View more

@SmashMix wrote: Any news from you regarding drain issue?   From my end, after trying the latest modem which is ERGC, I went back to ERG2 since it had less battery drain. Constantly getting 0.6%/he drain at night at idle with WiFi ON and AOD OFF. ... View more

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.  ... View more

@James0071 wrote: @XseverThanks for this. Really helpful information. What's the likelihood of it all crashing and bricking the phone? Very very low if you follow the instructions correctly, but this does trip the knox/warranty counter just so you know. ... View more

If you want to solve the battery drain problem, you'll need to install custom recovery TWRP (lots of guides and youtube videos online) then flashing the latest bootloader and modem zip file. I can help those interested. ... View more

@James0071 wrote: 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. ... View more

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. ... View more

Once again, I've been using a stock-based Oreo ROM from xda called Devbase 5.9 which has the latest ERG2 modem and ERG8 bootloader and battery life is better than Nougat. The latest update by Samsung should have updated the modem to erg2 which should have fixed the drain problem as is the case here. The drain for me using LTE at night with everything syncing is 1.3%/h. ... View more

I'm running a stock-based ROM from xda called DevBase 5.8 Oreo and i flashed on top of it the latest bootloader, modem, and kernel and my battery life is better than on Nougat. It's really sad if xda developers are doing a better job than Samsung. ... View more

@dj1891 wrote:   3.18.19-13895453-qb18810069 Are you sure it's 19 and not 91.   Mine is 3.18.91-13895453-QB18811252 ... View more

@dj1891 wrote: Ok so after 2 days of use I have noticed a couple of things.  The cell standby drain has gone, I've gone all day on 4g and Cell Standby is 2%. All stats are more balanced, ranging from 6% device idle to 1% for Gmail.  However battery life for me is no better.  At this stage of the day, just home from work I should be over 50% battery.  I'm now at 43% with same usage.  I also mentioned above I've noticed quite a few slowdowns and stutters which wasn't there before and yes I factory reset and cleared the cache when I first installed.   Sad to hear that. My experience with Oreo has been nothing but positive. Phone is smoother and faster and battery life improved in idle and in use.    Mind you I'm using a stock-based ROM called DevBase from xda with the latest kernel (3.18.91) and the phone is now running the latest bootloader ERG7 and modem ERG2. What kernel version is listed in your software information under about phone?  ... View more

 wrote: However for some reason, while in airplane mode, battery decreased by 6% last night, which seems quite high (1/2% previously). I'm running the latest ERG2 modem on my S7 flat and last night I put the phone in airplane mode for 5 hours and slept and when I woke up, battery drain was 0%.   ... View more

@Tecnico wrote: Guys, can anyone kindly provide a link to ERG2 CP file (modem) download only. It's just over 43 MB. No need to download/use the other parts of the Oreo update, right? Thanks in advance! Flat or Edge? I advise you install telegram, join a channel called "Sac23 chat group" and search there for all the latest bl and cp files.  ... View more

 wrote: The problem discussed in this thread isn't manifesting at night, while connected to WiFi (w/ or w/o AOD).  The issue is battery drain while connected to 4G. So, when you have a week of experience with your experiment, while connected to 4G, please update your report. Last night before going to bed, I made sure the phone is fully charged up, I unplugged it,  turned OFF AOD and Wi-Fi and left it on LTE all night.   Results: 1.2%/h battery drain for a total of 5 hours. On Nougat, the best I've gotten is 2.0%/h.    Again, my phone is an S7 Flat running an xda oreo stock rom called DevBase 5.8. My modem is now ERG2 which got updated 2 days ago and I got the modem off of a Telegram channel and flashed it using twrp. So where is Samsung out of this entire equation? Xda and telegram have been more helpful.    I look forward to your response ... View more

Bootloader ERG4 was released today. ERG2 remains the latest modem.  ... View more

@Droiderat wrote: @Xsever The problem discussed in this thread isn't manifesting at night, while connected to WiFi (w/ or w/o AOD).  The issue is battery drain while connected to 4G.   So, when you have a week of experience with your experiment, while connected to 4G, please update your report. I'll report back in a week, but for the hour drive back home on LTE, there was no abnormal drain at all. It's being reported all over Telegram and xda that the new modem released today for Netherlands and UK (EE), named ERG2, solves the drain. I did not flash it yet, but I will now and report back again. ... View more

Are all Samsung apps (Pay, Health, Pass) still working with this custom ROM? I only use Health out of the ones you mentioned and yes it's working perfectly fine. It's a stock ROM with a stock kernel, but debloated.   ROM Features: - Odexed (original stock files) + stock kernel - Multi CSC (list of natively supported CSC as above)  (*) - Removed SecurityLogAgent.apk (annoying on rooted phones) - Rooted systemlessly (Magisk v16.5 or SuperSU 2.82 SR5)  (*) - All original features are present and works (except KNOX related apps) - Added "App Lock" feature (Settings -> Advanced features) - No visual changes (100% stock look) ... View more

Here's my experience from yesterday which will burst a lot of bubbles here.   Up until yesterday, I was running Nougat on my S7 Flat without any battery drain or problem. I wanted to update to Oreo, but after reading all the horror stories here, I definitely did not update via OTA.   Instead, I downloaded a stock ROM from XDA called DevBase v5.8 (Oreo 8.0) and flashed it along with bootloader U2ERF6 and modem U2EREO. Since then, I've been enjoying an awesome Oreo experience without any battery drain at all. In fact, battery drain is better than Nougat. At night with wifi ON and AOD off, Nougat used to consume 0.7%/h, with Oreo, it's 0.6%/h.   So the moral of the story is that a developer on xda is able to do a better job than Samsung's entire department; and quicker! Sorry but this is the plain naked truth. ... View more

Well noted. Thank you for the clarification.   I just love how blazing quick Samsung is in reminding people that using "unofficial changes to the phone's software" will void the warranty while they are painfully slow in fixing a battery drain problem on 2-year old flagship phones. Honestly, these unofficial changes by forums like xda and the likes have been much faster than multi-billion $ Samsung in resolving issues with the rom, kernel, bootloader, and modem that Samsung is supposed to be responsible for. ... View more

I live in Lebanon where you only offer 1 year of warranty, sadly. Can you make it two years like the rest of the world? ... View more

My S7 Flat running a Note 8 7.1.1 ROM drains battery as per the following:   Idle, Wifi, AOD OFF, 0.7%/hr Idle, Wifi, AOD ON, 1.7%/hr Idle, LTE, AOD OFF, 1.3-2.0%/hr Idle, LTE, AOD ON, 2.8%/hr   I hope these stats help. ... View more