1. Login nyo muna sa 192.168.1.1 using pldthome account

2. After nyo maka login sa portal, edit nyo lang yung URL https://192.168.1.1/idu/home.asp into --> https://192.168.1.1/idu/bodyinfo_device.asp
Para ma check ang Firmware version ng PLDT FX-ID3

EXAMPLE:
Software
IDU Software Version	Evoluzn_PLDT_ID3_1.1.1.22
LTE Software Version	NZ_Evoluzn_FX_ID3_V07

3. After Ma check ng version, Mag login tayo sa Advance Web Server ng PLDT FX-ID3 using This Link --> https://192.168.1.1/login1.asp 

https://192.168.1.1/login1.asp <-- kapag ayaw , i-edit nyo nalalng from https to http.
Username: advance
Password: 3V0Lu2n@DvAn6E

4. Go to Upgrade / Downgrade Firmware URL:
https://192.168.1.1/adm/c3d72e5312f946deb63f7f5695fac56c.asp <-- kapag ayaw , i-edit nyo nalalng from https to http.

5. Click Choose File then Select Evoluzn_PLDT_ID3_1.1.1.21.bin, then Click Apply.

6. Wait mo lang mag Downgrade at Mag Full Reboot ang modem.

7. Login nyo ulit sa 192.168.1.1 using pldthome account.

8. After nyo maka login sa portal, edit nyo lang ulit yung URL https://192.168.1.1/idu/home.asp into --> https://192.168.1.1/idu/bodyinfo_device.asp
Para ma check ang Firmware version ng PLDT FX-ID3 kung successful ang Downgrade from 1.1.1.22 to 1.1.1.21

EXAMPLE:
Software
IDU Software Version	Evoluzn_PLDT_ID3_1.1.1.21
LTE Software Version	NZ_Evoluzn_FX_ID3_V07

9. Punta ulit tayo sa Upgrade / Downgrade Firmware URL:
https://192.168.1.1/adm/c3d72e5312f946deb63f7f5695fac56c.asp <-- kapag ayaw , i-edit nyo nalalng from https to http.

10. Click Choose File then Select Evoluzn_PLDT_ID3_1.1.0.bin, then Click Apply.

11. Wait mo lang ulit mag Downgrade at Mag Full Reboot ang modem.

12. Login nyo ulit sa 192.168.1.1 using pldthome account.

13. Congrats... Successful ang PLDT-FX-ID3 1.1.1.22 Downgrade to 1.1.0..

14. Perform Factory Reset, Done......

PLDT FX-ID3 Version 1.1.0 Advance Account
http://192.168.1.1/login1.asp
Username: advance
Password: @siaT3lco