I wanted to check the 64 bit version without disassembling my sBitx v3. It was possible via changing the boot order. The procedure is quite simple.
Just run "raspi-config" utility (in the terminal session and via "sudo"). Then in the advanced options you may set the boot order so that the USB disk is tried before the SD card.
With that I could boot my sBitx v3 from the 64-bit version installed (with dd) on the USB pendrive.
After successful testing, I could backup the original SD card. I have done it via dd, sending the output to the file on my server (mounted via sshfs).
I made a separate copy of the whole /home/pi/sbitx to recover the hardware calibration and my settings.
Finally I could install the 64 bit version with:
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$ sudo bash
# wget -O - | dd of=/dev/mmcblk0 bs=4M status=progress
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(172.19.1.1 is the IP of my server, where I have started an ad-hoc http server running "python3 -m http.server" in a directory where sb64p3.img was downloaded.)
After that I could mount the /dev/mmcblk0p2 partition and copy the saved configuration files.
The whole testing and installation was possible without disassembling the sBitx v3.
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73,
Wojtek SP5DAA
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