I want to fall back on the : Archer C64(US)_V1_1.12.1 Build 221212 version. How can I do this.

Dear Concern, In the previous version of this router, there was no issue for 2.5 Ghz & 5 Ghz wifi frequency. After upgradation to the new version, it seems that the 5 Ghz wifi frequency became too muc