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What is the process for Android Updates?

Hey guys. I was wondering, what is the process for android firmware updates? By this I mean, when I owned an iPhone (any model) after I updated the firmware there seemed to be remnants of the old firmware version and it would cause issues through the phone, at which point I would have to go on my computer, restore to the newest firmware essentially formatting the phone and re-uploading the new firmware on the phone. After that all was fine. Is this necessary on android in order to get a new, clean version of the firmware on the phone or does the update process do this throughout the installation? I haven't had any issues yet with the newest AT&T Nougat update, but I was just thinking about this and figured I'd ask before anything did happen, if it's like my old iPhones...
BTW, I'm on AT&T Samsung Galaxy S7 with Nougat 7.0

Just Purchased two S7's but one of them is running Marshmallow instead of Nougat

I just purchased two Dual-sim S7's from the same store on the same day in Hong Kong. One of them is running Nougat out of the box, while the other one is still on Marshmallow, with no updates available via OTA.
I've tried the following but none have allowed it to find an update:
Search for updates with and without a SIM card in the phone
Factory Reset from settings
Wipe cache partition/data/factory reset from Recovery
The Nougat phone shows:
"The latest updates have already been installed.
Current version:
G930FXXU1DQD8/
G930FOZS1DQD8/
G930FXXU1DQC8"
The Marshmallow phone shows:
"The latest updates have already been installed.
Current version:
G930FXXU1BPKF/
G930F0ZS1BPKF/
G930FXXU1DQQC8"
It seems 7.0 for this model was released at least 3 months ago and I'm surprised the Marshmallow phone still can't update to Nougat. Does anyone have any idea why Nougat is still not available for that phone, or can anyone point me in the right direction as to updating it to 7.0? Thank you in advanced.
I don't feel comfortable with the process of flashing firmware but if it comes to that scenario, I'll do it.

rcheung28 said:
I just purchased two Dual-sim S7's from the same store on the same day in Hong Kong. One of them is running Nougat out of the box, while the other one is still on Marshmallow, with no updates available via OTA.
I've tried the following but none have allowed it to find an update:
Search for updates with and without a SIM card in the phone
Factory Reset from settings
Wipe cache partition/data/factory reset from Recovery
The Nougat phone shows:
"The latest updates have already been installed.
Current version:
G930FXXU1DQD8/
G930FOZS1DQD8/
G930FXXU1DQC8"
The Marshmallow phone shows:
"The latest updates have already been installed.
Current version:
G930FXXU1BPKF/
G930F0ZS1BPKF/
G930FXXU1DQQC8"
It seems 7.0 for this model was released at least 3 months ago and I'm surprised the Marshmallow phone still can't update to Nougat. Does anyone have any idea why Nougat is still not available for that phone, or can anyone point me in the right direction as to updating it to 7.0? Thank you in advanced.
I don't feel comfortable with the process of flashing firmware but if it comes to that scenario, I'll do it.
Click to expand...
Click to collapse
Check in download mode which model it says it is, download the firmware from updato and flash with ODIN
Instructions all over the forum

*Detection* said:
Check in download mode which model it says it is, download the firmware from updato and flash with ODIN
Instructions all over the forum
Click to expand...
Click to collapse
I do want both phones to run the exact same firmware. Would it be safe to assume that I can flash G930FXXU1DQD8(Same firmware as the Nougat unit) to the Marshmallow phone?

rcheung28 said:
I do want both phones to run the exact same firmware. Would it be safe to assume that I can flash G930FXXU1DQD8(Same firmware as the Nougat unit) to the Marshmallow phone?
Click to expand...
Click to collapse
Like I say, check in download mode to ensure they are both the same models
Firmware model numbers, boxes, stickers etc can all be faked and often are, download mode cannot be faked
As long as they are both the same, yes you can flash the same firmware on both
Samsung Smart Switch might be able to update the MM one too

Update rooted device to newest firmware and keep root?

Hi all,
I have a dual sim XZ running the Thailand firmware and is rooted.
A new update just came out yesterday and I was wondering how I can upgrade my phone to newest firmware and keep root?
Also, if I use Flashtool and don't check the "data" option when flashing, my apps and data shouldn't get wiped when I update?

Manually updating to Oreo

Hi.
I have a G955U Galaxy S8+ AT&T Factory Unlocked on Android 7.0
Baseband Version: G955USQU1AQD9
Android Security Patch Level - April 1, 2017
I no longer live in the US, and currently in the Philippines. Phone works great and the signal is too and all, but I cannot get OTA updates.
Can I just download the firmware file in this thread and flash straight through ODIN, or do I need to follow another guide?
Thanks in advance

You can, however there are specific sequences to follow, so you have to update in firmware released order.
I encountered the same problem so I downloaded odin that worked for Nougat and loaded all version to BRB1 I think it is and then went to Oreo. Currently on CRC5.
Another note, when you are about to hit Oreo you will need to download the odin that works for Oreo. It can be found in the CRC5 thread.
Happy Updating

onedonrazor said:
You can, however there are specific sequences to follow, so you have to update in firmware released order.
I encountered the same problem so I downloaded odin that worked for Nougat and loaded all version to BRB1 I think it is and then went to Oreo. Currently on CRC5.
Another note, when you are about to hit Oreo you will need to download the odin that works for Oreo. It can be found in the CRC5 thread.
Happy Updating
Click to expand...
Click to collapse
Is this really necessary?
I want to update to Oreo as well but since I'm AT&T unlocked and not currently using AT&T network I'm stuck in the June software update so I'll have to flash like 7-8 firmware updates and each one being about 2-3 GB to download.
Also, is there any stock Samsung firmware I can download so I can avoid having to manually flash every software update? Or am I just stuck with the AT&T firmware?
Thanks in advance.

I'm also having this problem. Need to flash the updates through ODIN but I can't find every single stock file leading up to BR9 on this site. Do I really have flash them all? Or is there another way?

Downgrading from latest firmware (ASJA)

.I just want to share my experience with the firmwares (G970F).
First im not against with any updates for the phone but I accidentally press the update for the latest which is the ASJA (Philippines Carrier) and i realize it comes with a new bootloader which is S3 and the stock is U1.
Is there anything I can downgrade the bootloader so I can downgrade the complete firmware also? I want the stock firmware the first one (March 2019) because of my own preferences and I just want to stay with it. Any ways to solve this even on the near future? Glad to hear some ideas. Thanks

I have a similar question. After the recent Feb 2020 security patch update, the bootloader has been changed from 3 to 4. I so wish i had not updated. Is there anyway to go back to Android 9 which has BL 3 via Odin? Help would be appreciated, thanks.

im not sure its possible, moving from u4 to u3. the only possible solution o go back to android 9, is to find android 9 firmware with u4 security bit