Help After cache wipe, phone will not reboot

[groston]

Phone: Samsung Note 4, Android OS V5.1.1, rooted, stock ROM

My battery life has recently been quite poor. After some reading, I decided to wipe the cache. I booted my phone into TWRP and clicked on Wipe->Advanced and selected Cache and and dalvik/ART cache. Once this was done, I rebooted and TWRP presented a message to the effect of ' Install Super SU - your phone does not appear to be rooted'. I clicked yes (which was probably a mistake as SuperSU is on the phone).

The initial reboot seems to go okay, but the phone hangs with the Sprint SPARK screen. I have left the phone alone for up to 10 minutes, but rebooting shouldn't take this long - something seems to be quite wrong! I do not want to do a hard reset because of a) the amount of effort needed to reinstall everything (even with Titanium backup) and b) because I am fearful that my SMS and phone logs will be lost (not sure that Titanium backs those up).

I am currently using TWRP to backup my phone, but this is not going to solve the problem. What should I try? I am very nervous about not having my phone as my elderly father is having health issues and I need to be available...

Thanks for your suggestions!

 

[svim]

Taking into consideration all cache files are always going to be non-vital and self-restoring (but still necessary), it sounds like you might have inadvertently borked the operating system in some way.
Just a couple of long-short suggestions:
-- If you keep your Note in a case, check that none of the volume or power buttons are being affected if your phone has shifted out of place.
-- As your Note 4 has a user replaceable battery try removing the battery for a few minutes, put everything back together and see if it will boot up normally again.

You might just have to resort to re-flashing with a stock ROM. This will of course return it back to it's former, non-rooted state but it should get your phone working again. (... and be sure to double-check that the Re-partition option in the Odin utility is NOT enabled, so hopefully all your data will still be there).
https://updato.com/firmware-archive...&exact=1&r=&v=Lollipop(Android+5.1.1)&rpp=100

And for future reference, this 'SMS Backup & Restore' app does a nice job at backing up and restoring text messages and phone call logs:
https://play.google.com/store/apps/details?id=com.riteshsahu.SMSBackupRestore&hl=en_US

 

[groston]

svim,

Thanks for the reply. I did wind up re-flashing and then reinstalling SuperSU. The good news is that the user data was not impacted, so my SMS data was still there and it was not necessary to reinstall apps, etc.