Correct APP and connection to wifi Inkbird 308

Hi, I have bought sveral of the inkbird 308 wifi models to connect to my aquariums so I can control and monitor temperatures.

I have spent 3 hours but still not been able to connect the first unit.

I have downloaded the APP ( in fact three versions of the app - Injkbird, Inkbird Smart, and Inkbird Pro)

I learned that the wifi router needs to use only channel with 2.4 Ghz - so I have reset and restarted my router to use only 2.4 GHz.

Every time I follow the procedure to connect it fails I am close to the device and router.

i turn off the device for 10 seconds i I set to flash quickly the APP sets connecting through to 100% but then says device not connected - I tried now 20 times!

I check for other advice and try the slow flash method using Inkbird smart - I deleted the Apps and reinstalled only Inkbird smart - but now when I try every time I get the message ‘this account has been restricted due to illegal operations’

ARRRGGHH! I am going crazy now - this should be easier to set up - I have bough 8 of these to set up.

PLEASE HELP

WHICH APP do I use - HOW DO I CONNECT

Regards

Hello,
Please download the INKBIRD app. It is the latest app.
May I know if your 2.4GHz wifi has a password set?
Please check that the router settings and operating procedures are correct.