If the inverter is not running, no point in trying network. Basic's first.
YES for sure..
I helped my neighbor hook one of these up the other day (actually done two different ones recently), and I say keep with the basics first.
First change the AC output from 50Hz to 60Hz (same like you indicated in a previous post)...
The last one I did, we hadn't even done the Lifepower4 battery firmware yet (he has no internet yet), so we started by setting it to Lead-Acid battery, and then on BOTH Charge and Discharge screens set it to 'Use BatV'..
Also set the off-grid mode check box (somewhere there in the settings pages), and set the Run Without AC check box.
We got the inverter going without anything further. Of course make sure the batteries aren't freezing or alarming or anything like that (providing power to the inverter terminals).
Then once basic function works, can do the battery firmware (get it pre-staged on a laptop first, where you have an internet connection), set the correct address switch DIP settings, cabling and can try enabling Lithium Battery and Battery type 0, then set the 'Use BatV' back to 'Use SoC' on BOTH Charge and Discharge screens. Observe if there are any battery alarms seen on the 18kpv before assuming the comms are working.
Then do the USB memory stick firmware update method (as someone here already pointed out steps to do it), to upgrade the firmware on the inverter.
I also saw some people having issues with the WiFi when not using WPA2 or something to that effect (either had to turn it on or turn it off, or use WEP security instead, I don't remember the exact details there, just something to do with the encryption on the router making a difference in some cases (depending on the router brand).
Also to note, remember, the first time connecting to the WiFi, the phone is the client, while the inverter WiFi dongle is the access point, until you connect your phone to it, then enter the right info into the dongle, then the inverter dongle tries to switch and become a WiFi client and connect to your router for permanent operation.
And lastly, I know for sure with Starlink anyways, people have better results connecting these cheap WiFi dongles to them when you go into Starlink settings and select the 'Split 2.4g and 5g networks' so they don't try to run combined, older dongles and legacy WiFi client devices really have a hard time connecting to the single shared SSID for the two frequencies.