A405FN U2 Downgrade de firmware for unlock

UNLOCK INSTRUCTIONS:
To read security codes using sever:
1. Power on the phone.
2. Tap 7 times on 'Build number' in 'Settings'-'About phone' to enable 'Developer options',
go to 'Settings'-'Developer options' and enable 'USB debugging'.
3. Connect the phone to PC with USB cable, install drivers if needed.
4. Select device in ADB settings.
5. Press 'Read Codes via server' button, select 'Read codes ...' algo,
write your login and password in window if it will appear.
(Login and password will be saved as default after first input and can be changed in settings.)

Operation: Read Codes via Server [DIAG Jan 2021]
Selected model: SM-A405FN
Software version: 44.16

Checking Login and Password... OK
Balance: 20 crd.
You have 20 credit(s) left. This operation takes 5 credits. Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-A405FN
Android version: 9
PDA version: A405FNXXU2ASG1
CSC version: A405FNOBE2ASG1
Phone version: A405FNXXU2ASF2
Product code: SM-A405FZKDEVR
CSC country code: UK
CSC sales code: EVR
Carrier ID: EVR
Phone SN: R58MA3MHX9M
IMEI: 351777118487774
HW version: REV0.3A
RF cal date: 20191016
Chip name: EXYNOS7904
Modem board: SHANNON327
Security patch: 2019-07-01
Boot Warranty bit: 0
SIM State: ABSENT,ABSENT
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... OK
Searching Samsung diag port... detected COM12
Searching server... OK
Checking server answer... OK
Reading data from phone... OK
Backuping diag data... OK
Executing... OK
Restoring diag data... OK
Reading data from phone... OK
Calculating... OK
Searching server... OK
Waiting for server answer... OK
Freeze code(MCK, PUK): 74684071
NET lock: 59680713
SUB lock: 00000000
SP lock: 00000000
CP lock: 00000000
SIM lock: 00000000
For check lock status: *#7465625#
Done with Samsung Tool PRO v.44.16 [SM-A405FN,Read Codes via Server [DIAG Jan 2021]]