[Samsung Galaxy A70 Guides, News, & Discussion] haky 86:
In this tutorial I'd like to show you how to boot GSI on some european firmware, possible all too.

The Goal

I know that there already a topic about GSI, as we know not all GSI ROMs will boot by itself, extra hands would be useful, so please specify in your comments which firmware you boot those roms and how to help the other users for better experience.

How to Flash GSI ROMs

Requirements

A705FNXXU1ASD1 or equivalent. (I'm talking about March build for my case, the actual guide isn't worked for me)

Unloked Bootloader.

TWRP.

DM-Verity Disabler.

Kernel Sepolicy Patcher.

A/B ROMs

Steps:

Flash your GSI.

Flash DM-Verity Disabler.

Flash Kernel Selinux Patcher Follow script wizard I switch to Permissive to boot on ITV region firmware.

Tab Wipes > Factory Reset > YES.

Enjoy.

Booted ROMs on A705FNXXU1ASD1

Descendant (I'll report you).

OmniROM (SystemUI crashed).

How Can I Restore to OneUI?

Assuming that you are bored from GSI ROMs for many reason that you want to back to stock firmware but you don't know how to do, sit and drink something while read.

Requirements:

Odin, I'd reccomend the 3.13 version, click here to get it.

Your last firmware, sammobile is your friend.

Samsung USB drivers from Samsung Developers, must be installed on your system.

Steps:

Reboot to bootloader by pressing Vol Up and Vol Down together to enter "Downloade Mode".

Extract the downloaded firmware from SamMobile.

Open Odin application.

Before doing mistakes like me, give a look into extracted and see how must be configured in Odin (I'm basing my self with Italian firmware ** A705FNXXU1ASD1_A705FNOXM1ASD1_ITV** but should be same for other one).

AP_A705FNXXU1ASD1_CL15723567_QB22975198_REV00_user_low_ship_MULTI_CERT_meta_OS9.tar > must goes in AP.

BL_A705FNXXU1ASD1_CL15723567_QB22975198_REV00_user_low_ship_MULTI_CERT.tar > must goes in BL .

CP_A705FNXXU1ASD2_CP12349781_CL15723567_QB23029337_REV00_user_low_ship_MULTI_CERT.tar > must goes in CP.

CSC_OMC_OXM_A705FNOXM1ASD1_CL15723567_QB22975198_REV00_user_low_ship_MULTI_CERT.tar > must goes in CSC.

HOME_CSC_OMC_OXM_A705FNOXM1ASD1_CL15723567_QB22975198_REV00_user_low_ship_MULTI_CERT.tar >must goes in USERDATA

Now click on Options tab and select Auto Reboot and F.Reset Time.

Once you done with selecting files and options, it's time for flashing so make sure to see the COM port "CONNETTED" in Odin application, all you have to do it is click on "Start"

Is it Possible to Re-Flash OneUI without losing Data of GSI?

Yes and No, all you can do before flashing OneUI is uncheck "F.Reset Time" to avoid factory reset and prolly you'll get your old data from GSI without need to restore again each time.

Is it Possible to fix Knox?

No and NO.

The only "solution" to fix it, by sending a "dead" phone to replace the old motherboard. xD

Is it possible to Relock Bootloader?

Yes, let's see how.

Requirements:

Unlocked bootloader.

Stock recovery must be installed.

Steps:

Reboot the phone by keeping 2 Volume buttons pressed.

Long press with Volume Up in warning screen.

Press Volume Up to re-lock the bootloader, keep in mind will run factory reset automatically each time doing this step.

Reboot to OneUI > Conenct to Wifi and now you should see "OEM Unlock" in developers options.