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README: update for burning to SD card and locking with sdtool #24

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anton wants to merge 2 commits from anton/sd-card-instructions into main
pull from: anton/sd-card-instructions
merge into: public:main
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README.md
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@ -135,7 +135,7 @@ make shell
* Use `lsblk` to find device name * Use `lsblk` to find device name
* `dd if=out/airgap.iso of=/dev/<your_device> bs=4M status=progress oflag=direct` * `dd if=out/airgap.iso of=/dev/<your_device> bs=4M status=progress conv=fsync`
2. Use the `sdtool` to lock the SD Card: 2. Use the `sdtool` to lock the SD Card:
@ -156,7 +156,7 @@ make shell
d. Test that the card can't be written to: d. Test that the card can't be written to:
* `dd if=out/airgap.iso of=/dev/sdb bs=1M conv=sync status=progress` * `dd if=out/airgap.iso of=/dev/sdb bs=1M status=progress conv=fsync`
3. Verify that the hash of `airgap.iso` matches what's flashed on the SD card: 3. Verify that the hash of `airgap.iso` matches what's flashed on the SD card: