No connection after flash with openwrt on Tplink MR6400 v5 LTE

Hello everyone, I apologize in advance for the noob question and if, as I assume, the topic has already been discussed, but I have not found anything for now. So I flashed the aforementioned 4G router with OWRT latest rev for that device via tfpt. All ok router restarted with LUCI on. Now if I understood correctly I should proceed by downloading the packages I need and, in particular qmi which works for the 4G network with sim. To do this I must first navigate by connecting it to the fixed home router ... I read wiki, guides posts around but nothing, my situation is that if I connect the flashed tplink to the home router on the wan port I see the internet connection symbol but the pc connected to the lan port of the tplink connects but the internet is not available. I tried to connect it to the main router on the lan port and the pc on another lan port but even then (let's say using it as a switch) the pc navigates and the tplink does not ping outside the network. I understand that I should perhaps set the LAN ports "manually" via Luci or via command line... but I don't seem to have succeeded; what I understood is that I should give a static address different from 192.168.1.1 (which is the same as the main router let's say) gateway 192.168.1.1 and sub 255.255.255.0 but even doing so (at least I think) it doesn't seem to navigate. Can someone guide me step by step to make it navigate and finish installing packages? keeping in mind that once I manage to download I will only use it as a 4G router with SIM (I hope...). Sorry for the length of the post and noobs but... age advances. p.s. very bad at linux but I've been tinkering with various decoders and routers for years, first time with owrt

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Salve a tutti, chiedo sin d'ora perdono per la domanda da vero niubbo e se, come presumo,, l'argomento è stato già trattato, ma non ho trovato nulla per ora. Dunque ho flashato il predetto router 4G con OWRT ultima rev per quel device via tfpt. Tutto ok router riavviato con LUCI sopra. Ora se ho ben capito dovrei proceder scaricando i pacchetti che mi servono e, particolarmente qmi che funge per la rete 4G con sim. Per far questo devo farlo prima navigare attaccandolo al router fisso di casa ...ho letto wiki, guide post in giro ma nulla, la mia situazione è che se attacco il tplink flashato al router di casa su porta wan vedo il simbolo connessione internet ma il pc attaccato alla porta lan del tplink si collega ma internet non disponibile. Ho provato a attaccarlo al roter principale su porta lan e pc su altra porta lan ma nemmeno cosi (diciamo usandolo come switch) il pc naviga e il tplink non pinga fuori rete. Mi par di capire che dvrei forse settare "manualmente" via Luci o via riga comando le porte lan...ma non mi pare esser riuscito; quello che ho capito è che dovrei dare indirizzo statico diverso dal 192.168.1.1 (che è lo stesso del router principale diciamo) gateway 192.168.1.1 e sub 255.255.255.0 ma anche facendo cosi (almeno credo) non mi pare si navighi. Qualcuno che mi guida passo passo per farlo navigare e terminare installazione pacchetti? tenendo presente che una volta riuscito a scaricare lo userò solo come router 4g con sim (spero...). Scusate lunghezza post e niubbiaggine ma...l'età avanza. p.s. scarsissimo in linux ma smanetto da anni su decoder e router vari, prima volta con owrt

From which version you upgraded to which? ubus call system board
Do you have old config backup or we need to help you re-create config in new version?

Change the OpenWrt LAN to be in a different subnet range for example 192.168.2.1. This is a bit difficult to do with the GUI since it will try to revert the change. Wait until the revert change window pops up then click "Apply unchecked anyway" or similar button.

Then you can connect the wan port to your home's lan and it should reach the Internet.

That isn't necessary. You can just hit apply and then wait a bit before unplugging and then replugging the network cord. From there just point the browser to the new IP and login. You also could set your device to a static IP in the new subnet after hitting apply. Once again just point your browser to the new IP.

Applying unchecked it a great way to blow off your own foot.

I'm struggling to understand what is being asked based on the translation. It sounds like there is two different devices with one being cell connected. My guess is that the end goal is to have the 4G router be upstream and then the downstream TP-link be a switch and an AP.

Here is how I would set this up. I would first configure the upstream modem to be the firewall and dhcp server. This will be easiest since it is the one with the uplink. Next I would configure the downstream device to be a dumb switch by deleting all the firewall rules and interfaces and then creating a shared interface that has everything. If the downstream device needs a static IP that can be set on the upstream device.

For installing packages I would build a custom image using The OpenWRT firmware slector

Ths, changing IP range was the right way.