[Galaxy Tab S2 Android Development] retiredtab:
Frequently Asked Questions. You MUST READ this before posting any questions. Thank you.

Question	Answer
Q1. Can I build this ROM for myself? Where are the source and kernel source files?	A1. Yes, you can. The source files are listed below.

Kernel

https://github.com/retiredtab/android_kernel_samsung_universal5433-selinux

Device Tree

https://github.com/retiredtab/android_device_samsung_gts2-common-selinux

https://github.com/retiredtab/android_device_samsung_gts210wifi

Vendor

https://github.com/retiredtab/proprietary_vendor_samsung-selinux

The build manifest and instructions on how to compile from source are at

https://github.com/retiredtab/LineageOS-build-manifests

The other patch required for tcp/ip is at https://github.com/DerpFest-11/pack...mmit/22fd53a977eeaf4e36be7bf6358ecf2c2737fa5e
Q2. Is this ROM suitable as a daily driver?	A2. It might be, depending on your requirements. You would need to try it yourself, with your preferred apps, to see if suits your purposes. I've been using it myself since July 1, 2022 with no major issues.
Q3. What do I do if my app xyz doesn't work?	A3. I can't help diagnose problems with random apps I know nothing about. If the app is critically important to you and it doesn't work on this ROM, go back to a ROM where it did work.
Q4. Why is this ROM laggy and/or buggy?	A4. The device will be noticeably slower if you're using any Gapps package. Consider going gapps-free. A lot of apps will work without Google's services, or there exist alternatives that will. Check out F-Droid, Aurora Store, NewPipe, etc.
Q5. What TWRP should I use?	A5. You MUST use TWRP 3.6.2_9. Get it from

https://dl.twrp.me/gts210wifi/
Q6. Why should I use this ROM?	A6. You don't have to! If you don't like it, go back to your old ROM.
Q7. Will you offer monthly updates with security patches?	A7. We plan to do so. We will try to update the ROM with the monthly security patches after LineageOS has released them, free time permitting. Each monthly build will be tested to make sure all the "What works" functionality listed in post #1 still works, before it's made available (which might in some cases delay the release).
Q8. I'm a newbie. Can you provide step by step instructions?	A8. We simply don't have the time to do this, but there are lots of tutorials, videos, etc online showing how to flash custom ROMs and how to deal with common problems. Newbie questions are also accepted in the XDA General Questions and Answers forum.

Having said that pflyaz has kindly provided instructions in post #7.
Q9. Can I report a bug with respect to the ROM?	A9. Yes, but you need to supply the following information. If you don't, I won't look at it.

Provide an adb logcat of the problem, and if possible describe how to reproduce it. Note that I can't help if it involves downloading any app I don't already use that requires payment or creating a userid/password.

To get a logcat, open a terminal window on your PC, connect your device to it via USB, and do this:

# clear the logcat first
adb logcat -c
# start logcat trace
adb logcat > problem.txt
# reproduce problem
# wait until problem has occurred,
# then stop trace by hitting ctrl-c then zip the problem.txt file
# before uploading it.

Q10. How long will you build 19.1 for this device?	A10. For now, 19.1 will be built for all of 2022. After that, we will make a decision depending on a number of factors.
Q11. Do I need to erase everything and format my data before installing this ROM for the first time?	A11. If you're coming from stock Samsung Android, or an earlier version of LineageOS, or a different custom ROM, you MUST 'clean flash': boot to TWRP recovery, wipe system, data, dalvik/art cache, and cache partitions, then Format Data, then install this ROM.

If you don't do this you're likely to run into problems, such as getting stuck at the boot animation for more than 5 minutes.
Q12. What Gapps should I use?	A12. Your choice! There are several well-known Gapps packages, such as NikGapps, BiTGapps, OpenGapps, and MindTheGapps. Do your own research as to what is the most reliable gapps option for you. As a courtesy to gapps users, I opened a thread at

https://xdaforums.com/t/exynos5433-...on-for-19-1-roms-sm-t710-and-sm-t810.4480041/

for you to discuss gapps. Do not discuss gapps in this thread. Thank you.

You could also consider Google alternatives, such as Aurora Store, which mirrors the Google Play Store apps but doesn't need any Google services itself. Many Play Store apps do not actually depend on Google services.

If you are going to install any Gapps package, follow the installation instructions given for that particular package.
Q13. I'm having problems with Gapps. Can you tell me why it's not working?	A13. I can't answer any questions about Gapps, because I don't use them. Ask your questions on the XDA thread for the Gapps package you're using.
Q14. Why isn't my post answered?	A14. There are several possible reasons: the question is answered in the FAQ (in which case it will be ignored completely); or it involves apps or operating systems that I don't use; or it's about Gapps, which I don't use; or I simply have not had time to answer any questions.
Q15. What speed up/optimization tips do you suggest?	A15. These steps can make a big difference to performance:

Turn off animations. Go to Settings > System > Developer options, scroll down to the Drawing section, and set Window, Transition and Animator scale all to "Animation off".

Don't install Gapps unless you depend on something that only Google is providing. Use Aurora Store to get your preferred Play Store apps - they will all be available on Aurora Store. You can choose to access this anonymously or use a Google account.

Don't run more than two apps at the same time. You can probably listen to music in the background and use a web browser at the same time.

Use a web browser with built-in adblock and privacy features, such as Brave.

Use NewPipe to watch your streaming content. It has built in adblock so you don't have to watch forced ads.

Look for apps that are open source, ad-free and lightweight.

Q16. Does this ROM support Magisk so I can root my device?	A16. Magisk works with this ROM as reported by beta testsers, but that could change with any revision and changes by Google. However I don't use it myself and can't help with any related issues. Direct any questions about Magisk to the XDA Magisk forum.
Q17. Will this ROM ever become official?	A17. With 19.1, legacy devices like ours will NEVER be official due to lack of ebpf support. See https://lineageos.org/Changelog-26/
Q18. What is the difference between this ROM and others?	A18. This ROM tries to be pure LineageOS with little or no modification. Other ROMs may come with a different UI, different bundled apps, etc.
Q19. Will there be any major 19.1 code modifications in the future?	A19. There may be some major modifications along with some slight tweaking to the SEpolicy, small bug fixes and minor code cleanup, but all the hard work - getting the rom up and running, and fixing all the major bugs - has been done.
Q20. Why did you fork the trees?	A20. I wanted my own private branch where I could make changes that would only affect my own personal builds.
Q21. Can you build a variant of this device? For example, a LTE or S-pen version?	A21. I cannot and will not try to build for a variant device if I don't physically have that device. I have to be able to boot and test it myself, and there's no guarantee that I can get those variant features working.
Q22. Can I load this ROM on a variant device like LTE or S-pen version?	A22. This ROM is for the device explicitly listed and will only work on that device. Do not try to install it on any other device.

ONLY if you are an advanced user and understand TWRP, adb, odin, heimdall, etc, you could try loading it on a LTE or S-pen variant by modifying the updater-script, but be warned: there are likely to be problems, including a bricked device, bootloops, or the ROM not being able to support the functionality of LTE/S-pen.
Q23. Does this ROM have any wifi connection issues?	A23. This ROM's wifi has been stable on the specified device ever since lpedia and I determined the root cause of the wifi problems back in July 2021 and re-installed the original S2 network 'blobs' with LOS 17.1.
Q24. Is this ROM secure so I can do financial transactions?	A24. Although Android monthly security patches do improve general security, this ROM's outdated kernel and old proprietary vendor blobs/drivers will NEVER get updates of any kind, and could have significant security holes.

In addition, although the ROM is SElinux enforcing, there's a good chance that the rules written (about 800+ lines of code) have some errors.

If the device is rooted, this would further weaken the security.

With this information, it's up to you to make an informed decision about whether you trust this ROM to be secure enough for your financial transactions.
Q25. How do I turn off the taskbar at the bottom of the screen?	A25. Goto settings, system, buttons and disable taskbar.
Q26. Okay, I understand the consequences and willing to take the risks outlined, now where can I find the ALPHA rom?	A26. Downloads are at https://sourceforge.net/projects/retiredtab/files/SM-T810/19.1/