is my firmware version 3?

[lukasa1993]

{
"devname":"Smart Home Bell",
"model":"Bell 7S",
"serialno":"061294585",
"softwareversion":"3.2.1",
"hardwareversion":"",
"firmwareversion":"ppstrong-b5-tuya2_eltra-3.2.1.20200710",
"licence_id":"pp01f262ce82xxxxxxxx",
"licence_key":"LeuVlqKaduzF36BJRxxxxxxxxxxxx",
"identity":"MR2007071300900103",
"authkey":"LeuVlqKaduzF36BJRMExxxxxxxx",
"deviceid":"pp01f262ce82xxxxxx",
"pid":"vFHpaEFwu8xxxxx",
"WiFi MAC":"7c:25:da:0c:xx:xx",
"ETH MAC":"08:88:12:7c:xx:xx",
"mcuversion":"4.2.3.20200615"
}

not sure if its v4 or v3 ? and script doesn't seem to work for me i tried /proc/cmdline but /devices/deviceinfo i get this json from here so something must be same