2.4ghz wifi not working after update. Can I downgrade firmware to get it working again or factory reset. If I turn off 5ghz no network show up on phone even though 2.4 is showing as active in the app. Turn on the 5ghz and wifi appears again. I noticed as my wifi cctv no longer worked after update. The cctv cam only uses 2.4ghz. My Samsung s10 is happy with both but will not detect the 2.4 as working. Can I go back to previous firmware as it worked fine until latest upgrade.