Huawei E5573s-606 MIFI router Unlock

[vinna]

Hii friends, i have only 5 attempts and i need a code to unlock my MIFI router.
i read the post Unlock code for Huawei new algo V4 too but dont know how to downgrade the software version
please help me with this
thanks alot

My IMEI- 866079029868236
Software version- 21.316.03.00.393

i used the below codes but none of them seems to be working
ld code V1: 57332223
Code V2: 99162620
New algo code V3/201: 98467238
Flash code: 55765389

[vinna]

can someone help please

[vinna]

I tried to install version 21.xx.99.xx version
After installing the firmware browser automatically dosen't open
Even after installing webUI
192.168.8.1 doesn't show up