I managed to find an Authentication file.
As far as I understand, you need to look for it specifically for your MTK CPU (correct me if I’m wrong).
Go to https://androidmtk.com/mediatek-da-file and find the required chip. After downloading and unpacking it, you will see the auth_sv5.auth file.
However, I still cannot flash my device.
Here is what the fastboot getvar all command returned:
(bootloader) off-mode-charge: 1
(bootloader) slot-retry-count:b: 0
(bootloader) slot-retry-count:a: 1
(bootloader) slot-successful:b: no
(bootloader) slot-successful:a: yes
(bootloader) slot-unbootable:b: no
(bootloader) slot-unbootable:a: no
(bootloader) slot-count: 2
(bootloader) current-slot: a
(bootloader) unlocked: no
(bootloader) secure: yes
(bootloader) partition-type:userdata: f2fs
(bootloader) partition-size:userdata: 1b327f8000
(bootloader) has-slot:userdata: no
(bootloader) partition-type:vbmeta_b: raw
(bootloader) partition-type:vbmeta_a: raw
(bootloader) partition-size:vbmeta_b: 800000
(bootloader) partition-size:vbmeta_a: 800000
(bootloader) has-slot:vbmeta: yes
(bootloader) partition-type:super: raw
(bootloader) partition-size:super: 240000000
(bootloader) has-slot:super: no
(bootloader) partition-type:md1img_b: raw
(bootloader) partition-type:md1img_a: raw
(bootloader) partition-size:md1img_b: c800000
(bootloader) partition-size:md1img_a: c800000
(bootloader) has-slot:md1img: yes
(bootloader) partition-type:dtbo_b: raw
(bootloader) partition-type:dtbo_a: raw
(bootloader) partition-size:dtbo_b: 800000
(bootloader) partition-size:dtbo_a: 800000
(bootloader) has-slot:dtbo: yes
(bootloader) partition-type:vendor_boot_b: raw
(bootloader) partition-type:vendor_boot_a: raw
(bootloader) partition-size:vendor_boot_b: 4000000
(bootloader) partition-size:vendor_boot_a: 4000000
(bootloader) has-slot:vendor_boot: yes
(bootloader) partition-type:boot_b: raw
(bootloader) partition-type:boot_a: raw
(bootloader) partition-size:boot_b: 4000000
(bootloader) partition-size:boot_a: 4000000
(bootloader) has-slot:boot: yes
(bootloader) partition-type:lk_b: raw
(bootloader) partition-type:lk_a: raw
(bootloader) partition-size:lk_b: 400000
(bootloader) partition-size:lk_a: 400000
(bootloader) has-slot:lk: yes
(bootloader) version-baseband: MOLY.LR13.R2.MP.V79.5
(bootloader) is-userspace: no
(bootloader) serialno: T812128GB24292710019
(bootloader) product: tb8781p1_64
(bootloader) max-download-size: 0x4000000
(bootloader) version-bootloader: tb8781p1_64_12320e75cd4_202503100140
(bootloader) version: 0.5
all: Done!!
Finished. Total time: 0.057s
I see the following parameters:
(bootloader) unlocked: no
(bootloader) secure: yes
How can I bypass the errors and flash the device?
