The entire sequence usually takes 30–90 seconds, depending on the tool and the size of the binary (≈ 200 KB for the A4201G).
Since official ADB support is discontinued, the community has stepped up. Bookmark these places: pirelli adb prg a4201g firmware link
Warning on malware: Avoid “firmware download” sites that ask for paid surveys or credit cards. All legitimate firmware for the A4201G is free. The entire sequence usually takes 30–90 seconds ,
Current firmware may rely on simple checksum verification. Future releases are likely to embed ECDSA or RSA signatures so that only firmware signed by Pirelli’s private key can be installed, protecting against malicious injection. Warning on malware : Avoid “firmware download” sites