Hi I have the US version, Hardware version 1 and was having problems with 2.4ghz and 5ghz bands, my pc wouldnt detect either band and mobile devices would only detect one of the two 5ghz bands. PS4 would detect both bands but only connect to the 5ghz band. With these issues,  i updated the firmware to the latest one Archer C5400(US)_V1_170731, date 07-07-17 (4 years old). However it seems to be worse than the original firmware that came with the router. Please can tech support help resolve my problem? Having gone through the forum i see some have had their issues resolved through a beta firmware (link is no longer working). I paid alot for this router and any cheap router works better than this supposedly high end router. Very disappointed with this router. Hope tech support and any other techies can help me regarding this issue. Thank you .