Tasmota device undiscovered despite showing being connected to MQTT broker - old version of tasmota, upgrade from 8.1.0 to 9.3.1needed

Configuration
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We have to first convert this to tasmota minimal and then to tasmota full. please do like this.

  1. Download tasmota_ minimal.bin from this link
    https://github.com/arendst/Tasmota/releases/download/v9.3.1/tasmota-minimal.bin
  2. Ugrade tasmota to this by using the firmware upgrade tab as you have been doing with the tasmota.bin file.
  3. After upgade , you can see the tasmota minimal UI in the same ip address.
  4. Then upgrade this tasmota minimal to tasmota.bin from
    https://github.com/arendst/Tasmota/releases/download/v9.3.1/tasmota.bin

If anything, please ask