How to unblock 5 GHz channels on the ASUS RT-66U_B1

[Vectra]

Good afternoon!
I'm not a specialist in network technologies, so I'm asking for help!
There is a router ASUS RT-AC66U B1, it has the firmware Merlin RT-AC68U_380.66_6.
Task: to unlock all frequency channels. My actions:
1. Connected via SSH to the router by the PUTTY program and execute commands
Login as: admin
Admin@192.168.1.1's password:


ASUSWRT-Merlin RT-AC68U 380.66-6 Wed Jun 21 19:05:40 UTC 2017
Admin @ RT-AC66U_B1-46F8: / tmp / home / root # cd / tmp
Admin @ RT-AC66U_B1-46F8: / tmp # cp / dev / mtd0 cfe.bin
Admin @ RT-AC66U_B1-46F8: / tmp # nvram get bl_version
1.1.2.0

2. I extract the CFE binary file using the WinSCP program and save it on my computer.
Next, I edit the file CFE.bin with the HxD program, replace the lines:
0: ccode = EU
0: regrev = 33
1: ccode = EU
1: regrev = 33
On the lines:
0: ccode = # a
0: regrev = 0
1: ccode = # a
1: regrev = 0
And save the file as cfe_new.bin. With the help of the program WinSCP I put the file cfe_new.bin in the / tmp directory, there I put the file mtd-write v3
3. Then I execute the commands:
Admin @ RT-AC66U_B1-46F8: / tmp # mtd-unlock -d boot
Unlocking 0x0 - 0x1ffff
Unlocking 0x20000 - 0x3ffff
Unlocking 0x40000 - 0x5ffff
Unlocking 0x60000 - 0x7ffff
"Boot" successfully unlocked.
admin@RT-AC66U_B1-46F8:/tmp# chmod +x mtd-write
admin@RT-AC66U_B1-46F8:/tmp# ./mtd-write cfe_new.bin boot
reboot

4. Dapee I do cleaning nvram and reset to factory settings
But at the entrance to the router I have only channels from 36 to 140 ..

What am I doing wrong? Help me please!