So I've encountered this error after I installed postmarketOS to the SD card. As I'm testing the OS on the Fairphone 5, I noticed the [FP5 instructions on how to do](https://wiki.postmarketos.org/wiki/Fairphone_5_(fairphone-fp5)) so were out of date. First I installed it to the SD card with ``pmbootstrap install --sdcard=/dev/sda``, once it was installed on there, I removed the SD card and placed it into the Fairphone 5. I then ran ``pmbootstrap flasher boot`` as according to the [up-to-date instructions](https://wiki.postmarketos.org/wiki/Dual_Booting/WiP). It worked, and I booted into postmarketOS. Awesome! So I did some testing, then I decided to reboot and switch back to my Android OS. And then that's where the troubles began: It wouldn't boot past the fastboot screen. So my next option was to try and boot a TWRP recovery image. Did it work? Nope! This is the exact error I got: ``` administrator@MS-7984:~/Downloads/platform-tools-latest-linux/platform-tools$ ./fastboot boot ../../twrp-3.7.1_12-0-FP5.img Sending 'boot.img' (98304 KB) OKAY [ 2.050s] Booting FAILED (remote: 'Failed to load/authenticate boot image: No Media') fastboot: error: Command failed ``` Now I'm really curious as to how to fix this issue. I've searched everywhere online for this, but this error was completely non-extistent and unheard of. And just to be absolutely sure. Yes, my Android partitions are still there. I've tried ``fastboot getvar current-slot`` to get the current slot (which was slot b), then I did: ``` fastboot set_active a fastboot set_active b ``` And it didn't work at all. I've even tried taking out the battery and putting it back in. Nothing worked. The only thing that I can do is run ``pmbootstrap flasher boot``, but that only boots into postmarketOS. I've even tried flashing my backed up boot partition to the boot partition via fastboot, and it *still* doesn't work. So I'm really curious if anyone here has had this issue and if there's any workaround to this issue?