I am in doubt in this.
There might be malware sitting in BIOS.
I do not think there is any problem if the flash drive used for the installation is not having malware. Reinstalling the OS has been the method that people are recommending.
One way that might work easier (somebody more knowledgeable should confirm) is to boot from a Tails USB and at boot time select (in offline mode settings) to stay without network (now the default is with network on). It's not my blog, I've found it on web search, but one of the last images
on this page shows what I want to tell.
Of course that if you want to use it for air gapped wallet you may want o enable persistence and so on, hence still things to learn and check.
I hearrd that tails OS comes with Electrum installed. It would be a good option for airgapped devices.
I was thinking to remove the WiFi card and Bluetooth but my laptop Is inbuilt so If I want to remove this things i will have to unculple the laptop which might lead to damage.
You can check some YouTube videos for it. Just search it on YouTube and you will get some useful information that would be helpful.
