[Galaxy Tab 4 Android Development] BeeJ1109:
Hi Martin, Matteo,

Have Tab 4 Millet T330, been using Matteo LOS16 builds for years now.

Used TWRP V3.4.0-4 To always do Full Nandroid Backups of All partitions. So I can restore any partition, even Stock 5.1.1 with many apps.

Use Magisk to Root device.

Found latest Magisk or TWRP being 3.5, do not backup every partition. Some options are being left out by Devs, and now are being generated by a machine, no human input.

Have discussed this with Matteo several times, he can not see the benefit of backing up Modem, EFS, Persist partitions. But I can totally Restore everything, whilst experimenting with LOS 17.1, now LOS 18.1, as well as your CRDroid builds being 5, 6 now 7. As well as DJAB 17.1 ROMs.

I had as mentioned earlier, been on Matteo's LOS16. Nov builds, having issues with AFH "No Mirrors" Issues, decided to try OLD Nandroid backups saved of DJAB, Matteo LOS 17.1, & 18.1, and your CRDroid 6. Used Mega to download Dec builds as well as, CRDroid 7.13

For some reason Matteo LOS 17.1 and 18.1 bootloop, stay on Samsung Logo, or return to Download mode or Recovery mode on TWRP.

Done Clean wipe of Cache, Dalvik-cache, System, or tried Dirty Flash as different ROMS are Lineage base.

Finally needed to restore an OLD Stock 5.1.1 Nandroid Backup to get Tab 4 T330 MilletWiFi working again.

What I found, was I could either Dirty Flash CRDroid 6 or Clean wipe then Flash.

I always wipe cache & Dalvik-cache, before Flashing ROM or Wipe System as well.

Your ROMs both 6.25 or 7.13 always bootup, without any issues, as I have with LOS or LFR ROMs being Nov builds vs your Dec builds.

Wondering whether these issues are because I had installed CRDroid 6.25 then Wiped and Flashed back dated LOS 17.1 or 18.1 or LFR 17.1. All being Nov builds.

Finally I thought I try CRDroid 7.13 and Gapps Nano 11.

Installed OK finished apps Downloaded from Google Backup stored under T330.

Updated some 30 apps to latest.

PROBLEM FOUND.

Required Magisk to Root the boot.IMG. fails as no access to Root directory /vendor.

Using Magisk install via TWRP, as per normal. ROOT FAILS.

Tried other apk files installs, Nothing works. Normally can click on any stored app in download or backup files via any File Manager. I use X-Plore Pro or Files app, included as part of ROM builds.

Looking thru any log provided by any Nandroid Backup or Restore always are Successfully completed. For any ROM mentioned above.

Funny now all of a sudden getting bootloops, lockup on logos. Not starting with functional ROM, except for your CRDroid 6.25 or 7.13 builds.

Nandroid backups also include "data with int. storage" partition, as I always use Magisk TWRP Helper v1.0 additional prop.

Maybe I may need to Wipe ALL except internal or external memory and start from scratch from Stock again, then Flash each ROM in turn, FULL Nandroid Backup on each Dev's ROM. That ALL WORKED PREVIOUSLY. Using Clean Flash for each Android 9, 10 & 11 method.

Noted each ROM "BOOT.IMG is slightly different size between Android 10 in each DEV's build .. Maybe the cause of my sudden boot loop issue, whilst swapping between each ROM, even though ALL builds are Android 10 Lineage ROMs.

Same with Android 11 Lineage ROMs. Clean Flash is Best Method.

Dirty Flash for ONLY UPDATES of Same ROM Build by Same DEV.

I could attach TWRP recovery logs if required.

Any thoughts

Cheers

BJ

More Updates.

Found wipe and reflashing any ROM after Restoring, using TWRP FULL NANDROID BACKUP (8 Partitions) that reboots to Download option in TWRP.

Fixes any Bootup issue. Same for both Matteo LOS 17.1, 18.1 and your CRDroid 6.25, 7.13 ROMs. I also use Clean Flash, redo Magisk Root, and Latest Gapps pico for Android 10 or 11. Then each ROM is Booting as per normal.

Then make new Nandroid Backup for each ROM saved to my extSDcard. Repeated Restore Same issue, Reflash ROM FIXED.

Never had any issues for years with Matteo's LOS 16 ROM on my MilletWIFI Tab 4 SM-T330.

Second Issue is extSD Card 256GB is NOT Recognised. Reported as Corrupt.

Previously formatted and restored ALL DATA, using PC formatted as exfat,, & transferred files back. Tested SD card NO ISSUES. Tried card in any other Phone or Tablet. NO ISSUES.

Replaced SD Card back in T330. Tried testing using every ROM as above.

SD card is CORRUPT in CRDroid, 6.25, 7.13, LOS 18.1

BUT NO ISSUES in LOS 16, & 17.1. As well as using TWRP Backup, Restore, File Manager Transfer, copy, move, or delete. ExtSD card inserted in T330.

CORRUPT ISSUE caused by 3 of 4 ROMs, VERY STRANGE.

ExtCard OK in TWRP, PC & other Tablets, Phones.

Other than that ALL ROMs are Great. Top effort from Martin & Matteo.

Sorry about long Message, but needed to explain the procedure and testing of your later releases.

Happy New Year.

Cheers

BJ