I've done more testing after ~30 hours of the phone remaining connected to the 2.4 GHz WiFi, and can say that my previous testing was wrong and as such my reporting on it was also wrong, for which I apologize.
It seems that every time I tested and the phone could not connect, I actually checked the
Disable 11b
checkbox. Testing again either one of
AsusWRT-Merlin 386.4_0
,
AsusWRT 3.0.0.4.386.45934
or
AsusWRT 3.0.0.4.386.45987
, all hard reseted by holding the WPS button, the phone connects as long as I don't apply the checkbox and fails to connect if applying the checkbox.
View attachment 38487
More over, applying the
Disable 11b
checkbox sets the nvram variables
wl_rateset
and
wl0_rateset
from the default values of
default
to the new value of
ofdm
and cannot be removed using the WebUI. It can be done from the terminal by executing the following commands:
Code:
nvram set wl_rateset=default
nvram set wl0_rateset=default
nvram commit
service restart_wireless
Try these, in this order:
- soft remove all usb drives attached to the router: go to Network Map (/index.asp), under USB 2.0 and/or USB 3.0, hit
Remove
button. This frees up RAM that can be used in the firmware upgrade process, which gives a better chance of successful upgrade. You can leave the drives physically attached to the router as long as you don't reboot before the upgrade;
- if 1. fails, cold boot the router without any usb drives attached: turn off router by power button or removing the plug from wall or router, disconnect all usb devices from router, wait ~20 seconds for the electricity remaining in capacitors to drain, replace the plug or press the power button, let the router boot and then try the upgrade;
- if 2. still fails, first make a backup of your configuration (and jffs partition if you have it enabled) in Administration - Restore/Save/Upload Setting (/Advanced_SettingBackup_Content.asp),
Save settings
button (and Save
button for the jffs partition). Then hard reset the router by following the instructions in this link: https://www.asus.com/us/support/FAQ/1039074. After the router boots up, go through the initial wizzard of setting WAN, WiFi and a new user and password and then try the upgrade again;
- if even 3. fails, you can use the ASUS Firmware Restoration utility to upgrade the firmware;
- if 4. fails also, check that your
RT-AC68U_386.4_0.trx
file has the correct sha256 checksum of 9999cd9a12f97f927af0298a295dcfe269c71e21053e3ae17b4bec4dce0a69a8
.