[Samsung Galaxy A6 Guides, News, & Discussion] The Solutor:
Hi guys, it's a while since my last post on XDA, but a couple of days ago I got that phone and I started playing with it.

I spent literally one day to figure out how to get the damn thing working. I NEEDED Android 10 (too long to explain why, given I usually stick with the oldest version available)

The problem is that the broken lockscreen is just the tip of the iceberg, with broken biometrics and/or keystore a lot of apps are broken as well (banking apps, billing apps, and also simpler apps that relies on such features (like the current Parallels RDP client)

Long story short, after a lot of reading here and elsewhere looks like no one before me had a fully working A6+ with root and A10, so I accepted the challenge and used a lot of my free time flashing and reflashing and testing, and finally the stubborn thing surrended.

So below is what what you need to do to to have a fixed phone

(I assume you have already unlocked your bootloader)

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#1 Flash Android 10 with odin (I suggest to use an U5 build, so you can go back to Android 9 (if you want/need to)

#2 Boot the phone once, skip the google account part but connect it to internet once or you will be stick to PRENORMAL condition (and you can't flash anything except official firmwares)

#3 Extract boot.img from the official firmware using 7zip ZETA STANDARD (not the plain 7zip!!!). C opy the file to the phone (say the download folder)

#4 Install Magisk 24 (not 25, not 22), Magisk 23 may work as well. Use magisk to install itself on the boot.img file (it's your only option since the phone isn't yet rooted), copy the patched file back to your PC, RENAME IT to boot.img, and compress it to boot.tar using 7zip

#5 Use odin, be sure to uncheck the autoreboot option then flash boot.tar, w/o rebooting the phone flash the TRWP recovery (disconnect and reconnect the USB cable before the 2nd flash operation).

Use the old twrp_3.2.3-1_sm-a605_141218.tar (it's buggy, but newer recoveries 3.5.x.x are more buggy, in a different way)

#6 reboot to recovery, format data (I mean FORMAT not just wipe !!!), then reboot to recovery (if you can mount the data partition you are OK for the next step)

#7 Install the lockscreen fix for Pie SM-A605-keymaster-fix-by-Not_Sure.zip (here)

#8 Install Disable_Dm-Verity_ForceEncrypt_11.02.2020.zip (not Disable_Dm-Verity_ForceEncrypt_03.04.2020.zip or no-verity-opt-encrypt-6.0.zip as suggested in other threads), don't install other suggested files like "RMM-disable-something")

#9 Reboot to system, and you are almost done

#10 check the lockscreen, if everything is ok, install the magisk 24 apk, and open it (it may ask to do additional configurations and reboot the phone

#11 enjoy your rooted and fully working phone :)

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Optionally you can flash the latest U8 android 10 w/o having to upgrade your bootloader, to do so you can flash just the system and vendor partitions.

To do so you have to extract them from the AP file from the very latest FW for your phone then recompress the img files to tar (same thing as boot file described in #3 for boot image.

If you do so you need to repeat the above steps starting from #7

The lockscreen fix still works on freshest A10 (tested personally)

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That's all, I hope this help the (few) people who owns this phone.