Dynalink DL-WRX36 - What Is Format Rule of Wifi Password; My Internet Connection Is Not Stable after Recent Firmware Upgrade, What Is the Problem

DynalinkXDL-WRX36 | FAQ & Troubleshooting
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What is format rule of WiFi password?
 At least 8 characters and less than 63 characters
 Alphabetic and numeric characters are allowed
 Special characters are allowed except “Space” and “&”
My Internet connection is not stable after recent firmware upgrade, what is the
problem?
Released in firmware version 1.10.01.201, we introduced a new Automatic MTU (Maximum Transmit Unit) feature.
However, we found some cable modem might be giving a very small MTU value and that will cause Internet access
problem. If you found similar symptom, please follow below Troubleshooting instruction for “cannot connect to
Internet” and change the MTU setting accordingly.