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How to update BIOS on Dell Inspiron 3721 without battery (or with a dead battery)
(Only tested with BIOS version A14 for Dell Inspiron 3721)
- Download BIOS version A14 from the official dell website.
- Extract the content of the 3721A14.exe file to a folder with 7-zip (there may be en extraction error: "Cannot open the file as [PE] archive", it's all right).
- Run "InsydeFlash.exe" file in the folder, there will be an error message "The AC adapter and battery must be plugged in before the system BIOS can be flashed". Press cancel.
- A file named "platforms.ini" will be created in the directory after you run "InsydeFlash.exe", rename it to "platform.ini".
- Open the file and find text "BatteryCheck=1", replace it with "BatteryCheck=0", save the file.
- Run "InsydeFlash.exe" again, no battery warnings should appear.
- Pray that your power company does not switch off the power during the BIOS update.