Seems like it can be remain mounted by TWRP on doing a format. (or when you manually mount it) https://gitlab.com/postmarketOS/pmbootstrap/blob/master/aports/main/postmarketos-android-recovery-installer/pmos_install#L65 ``` + export CHROOT=/tmp/postmarketos/chroot + unzip -o /sdcard/pmos-samsung-kminilte.zip chroot/* -d /tmp/postmarketos Archive: /sdcard/pmos-samsung-kminilte.zip creating: chroot/ inflating: chroot/install_options creating: chroot/bin/ inflating: chroot/bin/partprobe inflating: chroot/bin/umount inflating: chroot/bin/mkfs.ext2 inflating: chroot/bin/cryptsetup inflating: chroot/bin/pmos_install_functions inflating: chroot/bin/findfs inflating: chroot/bin/tar inflating: chroot/bin/mkfs.ext4 inflating: chroot/bin/kpartx inflating: chroot/bin/pmos_setpw inflating: chroot/bin/parted inflating: chroot/bin/busybox inflating: chroot/bin/pmos_install creating: chroot/lib/ inflating: chroot/lib/libcrypto.so.43 inflating: chroot/lib/libext2fs.so.2.4 inflating: chroot/lib/libmount.so.1.1.0 inflating: chroot/lib/libncursesw.so.6.1 inflating: chroot/lib/libncursesw.so.6 inflating: chroot/lib/libparted.so.2.0.1 inflating: chroot/lib/libblkid.so.1.1.0 inflating: chroot/lib/libjson-c.so.4 inflating: chroot/lib/libreadline.so.7.0 inflating: chroot/lib/libuuid.so.1.3.0 inflating: chroot/lib/libdevmapper.so.1.02 inflating: chroot/lib/libcryptsetup.so.12 inflating: chroot/lib/libcryptsetup.so.12.2.0 inflating: chroot/lib/libreadline.so.7 inflating: chroot/lib/libext2fs.so.2 inflating: chroot/lib/libe2p.so.2.3 inflating: chroot/lib/libpopt.so.0 inflating: chroot/lib/libjson-c.so.4.0.0 inflating: chroot/lib/libuuid.so.1 inflating: chroot/lib/ld-musl-armhf.so.1 inflating: chroot/lib/libe2p.so.2 inflating: chroot/lib/libblkid.so.1 inflating: chroot/lib/libparted.so.2 inflating: chroot/lib/libcom_err.so.2 inflating: chroot/lib/libcom_err.so.2.1 inflating: chroot/lib/libmount.so.1 inflating: chroot/lib/libargon2.so.1 inflating: chroot/lib/libc.musl-armhf.so.1 inflating: chroot/lib/libcrypto.so.43.0.1 inflating: chroot/lib/libpopt.so.0.0.0 + . /tmp/postmarketos/chroot/install_options + DEVICE=samsung-kminilte + FLAVOR=samsung-kminilte + FLASH_KERNEL=true + ISOREC=false + KERNEL_PARTLABEL=BOOT + INITFS_PARTLABEL=RECOVERY + SYSTEM_PARTLABEL=SYSTEM + INSTALL_PARTITION=system + CIPHER=aes-cbc-plain64 + FDE=true + [ true = true ] + echo #!/sbin/sh + echo chroot /tmp/postmarketos/chroot /bin/pmos_setpw + chmod 755 /sbin/pmos_setpw + umount /tmp/postmarketos/chroot/pmos.log umount: can't umount /tmp/postmarketos/chroot/pmos.log: No such file or directory + rm /tmp/postmarketos/chroot/pmos.log rm: can't remove '/tmp/postmarketos/chroot/pmos.log': No such file or directory + : + touch /tmp/postmarketos/chroot/pmos.log + umount /tmp/postmarketos/chroot/pmos.zip umount: can't umount /tmp/postmarketos/chroot/pmos.zip: No such file or directory + rm /tmp/postmarketos/chroot/pmos.zip rm: can't remove '/tmp/postmarketos/chroot/pmos.zip': No such file or directory + : + touch /tmp/postmarketos/chroot/pmos.zip + mount --bind /tmp/postmarketos/pmos.log /tmp/postmarketos/chroot/pmos.log + mount --bind /sdcard/pmos-samsung-kminilte.zip /tmp/postmarketos/chroot/pmos.zip + fstab_recovery=recovery.fstab + [ ! -e /etc/recovery.fstab ] + fstab_recovery=twrp.fstab + cp /etc/twrp.fstab /tmp/postmarketos/chroot/twrp.fstab + mkdir -p /tmp/postmarketos/chroot/dev + mount --bind /dev /tmp/postmarketos/chroot/dev + mkdir -p /tmp/postmarketos/chroot/proc + mount --bind /proc /tmp/postmarketos/chroot/proc + mkdir -p /tmp/postmarketos/chroot/sys + mount --bind /sys /tmp/postmarketos/chroot/sys + chmod 755 /tmp/postmarketos/chroot/bin/busybox /tmp/postmarketos/chroot/bin/cryptsetup /tmp/postmarketos/chroot/bin/findfs /tmp/postmarketos/chroot/bin/kpartx /tmp/postmarketos/chroot/bin/mkfs.ext2 /tmp/postmarketos/chroot/bin/mkfs.ext4 /tmp/postmarketos/chroot/bin/parted /tmp/postmarketos/chroot/bin/partprobe /tmp/postmarketos/chroot/bin/pmos_install /tmp/postmarketos/chroot/bin/pmos_install_functions /tmp/postmarketos/chroot/bin/pmos_setpw /tmp/postmarketos/chroot/bin/tar /tmp/postmarketos/chroot/bin/umount + chmod 755 /tmp/postmarketos/chroot/lib/ld-musl-armhf.so.1 /tmp/postmarketos/chroot/lib/libargon2.so.1 /tmp/postmarketos/chroot/lib/libblkid.so.1 /tmp/postmarketos/chroot/lib/libblkid.so.1.1.0 /tmp/postmarketos/chroot/lib/libc.musl-armhf.so.1 /tmp/postmarketos/chroot/lib/libcom_err.so.2 /tmp/postmarketos/chroot/lib/libcom_err.so.2.1 /tmp/postmarketos/chroot/lib/libcrypto.so.43 /tmp/postmarketos/chroot/lib/libcrypto.so.43.0.1 /tmp/postmarketos/chroot/lib/libcryptsetup.so.12 /tmp/postmarketos/chroot/lib/libcryptsetup.so.12.2.0 /tmp/postmarketos/chroot/lib/libdevmapper.so.1.02 /tmp/postmarketos/chroot/lib/libe2p.so.2 /tmp/postmarketos/chroot/lib/libe2p.so.2.3 /tmp/postmarketos/chroot/lib/libext2fs.so.2 /tmp/postmarketos/chroot/lib/libext2fs.so.2.4 /tmp/postmarketos/chroot/lib/libjson-c.so.4 /tmp/postmarketos/chroot/lib/libjson-c.so.4.0.0 /tmp/postmarketos/chroot/lib/libmount.so.1 /tmp/postmarketos/chroot/lib/libmount.so.1.1.0 /tmp/postmarketos/chroot/lib/libncursesw.so.6 /tmp/postmarketos/chroot/lib/libncursesw.so.6.1 /tmp/postmarketos/chroot/lib/libparted.so.2 /tmp/postmarketos/chroot/lib/libparted.so.2.0.1 /tmp/postmarketos/chroot/lib/libpopt.so.0 /tmp/postmarketos/chroot/lib/libpopt.so.0.0.0 /tmp/postmarketos/chroot/lib/libreadline.so.7 /tmp/postmarketos/chroot/lib/libreadline.so.7.0 /tmp/postmarketos/chroot/lib/libuuid.so.1 /tmp/postmarketos/chroot/lib/libuuid.so.1.3.0 + chroot /tmp/postmarketos/chroot /bin/pmos_install + /bin/busybox --install /bin + . /bin/pmos_install_functions + export 'PATH=/bin' + export 'LD_LIBRARY_PATH=/lib' + . /install_options + DEVICE=samsung-kminilte + FLAVOR=samsung-kminilte + FLASH_KERNEL=true + ISOREC=false + KERNEL_PARTLABEL=BOOT + INITFS_PARTLABEL=RECOVERY + SYSTEM_PARTLABEL=SYSTEM + INSTALL_PARTITION=system + CIPHER=aes-cbc-plain64 + FDE=true + ui_print ' ' + echo 'ui_print ' + echo ui_print + ui_print ' 8 ' + echo 'ui_print 8 ' + echo ui_print + ui_print ' 888 ' + echo 'ui_print 888 ' + echo ui_print + ui_print ' 88888 ' + echo 'ui_print 88888 ' + echo ui_print + ui_print ' 8888888 ' + echo 'ui_print 8888888 ' + echo ui_print + ui_print ' 888888888 ' + echo 'ui_print 888888888 ' + echo ui_print + ui_print ' 88888888888 ' + echo 'ui_print 88888888888 ' + echo ui_print + ui_print ' 888888888888 ' + echo 'ui_print 888888888888 ' + echo ui_print + ui_print ' 8 888888888888 ' + echo 'ui_print 8 888888888888 ' + echo ui_print + ui_print ' 888 88888888 ' + echo 'ui_print 888 88888888 ' + echo ui_print + ui_print ' 88888888 88888888 ' + echo 'ui_print 88888888 88888888 ' + echo ui_print + ui_print ' 88888888 88888888 ' + echo 'ui_print 88888888 88888888 ' + echo ui_print + ui_print ' 88888888 88888888 ' + echo 'ui_print 88888888 88888888 ' + echo ui_print + ui_print ' 88888888 88888888 ' + echo 'ui_print 88888888 88888888 ' + echo ui_print + ui_print ' 88888888 888 ' + echo 'ui_print 88888888 888 ' + echo ui_print + ui_print ' 88888888 8 88888 ' + echo 'ui_print 88888888 8 88888 ' + echo ui_print + ui_print ' 88888888 8888888 ' + echo 'ui_print 88888888 8888888 ' + echo ui_print + ui_print ' 88888888 88888888 ' + echo 'ui_print 88888888 88888888 ' + echo ui_print + ui_print ' 88888888888 8888888888888888888888 ' + echo 'ui_print 88888888888 8888888888888888888888 ' + echo ui_print + ui_print ' 8888888888888 8888888888888888888888 ' + echo 'ui_print 8888888888888 8888888888888888888888 ' + echo ui_print + ui_print ' 8888888888888 888888888888888888888888 ' + echo 'ui_print 8888888888888 888888888888888888888888 ' + echo ui_print + ui_print '8888888888888 88888888888888888888888888' + echo 'ui_print 8888888888888 88888888888888888888888888' + echo ui_print + ui_print ' ' + echo 'ui_print ' + echo ui_print + ui_print 'postmarketOS recovery installer ' + echo 'ui_print postmarketOS recovery installer ' + echo ui_print + ui_print ' ' + echo 'ui_print ' + echo ui_print + mountpoint -q /mnt/pmOS + '[' -e /dev/mapper/pm_crypt ] + ui_print 'Symlinking block devices...' + echo 'ui_print Symlinking block devices...' + echo ui_print + ln -sf /dev/block/loop0 /dev/block/loop1 /dev/block/loop2 /dev/block/loop3 /dev/block/loop4 /dev/block/loop5 /dev/block/loop6 /dev/block/loop7 /dev/block/mmcblk0 /dev/block/mmcblk0boot0 /dev/block/mmcblk0boot1 /dev/block/mmcblk0p1 /dev/block/mmcblk0p10 /dev/block/mmcblk0p11 /dev/block/mmcblk0p12 /dev/block/mmcblk0p13 /dev/block/mmcblk0p14 /dev/block/mmcblk0p15 /dev/block/mmcblk0p16 /dev/block/mmcblk0p17 /dev/block/mmcblk0p18 /dev/block/mmcblk0p19 /dev/block/mmcblk0p2 /dev/block/mmcblk0p20 /dev/block/mmcblk0p21 /dev/block/mmcblk0p3 /dev/block/mmcblk0p4 /dev/block/mmcblk0p5 /dev/block/mmcblk0p6 /dev/block/mmcblk0p7 /dev/block/mmcblk0p8 /dev/block/mmcblk0p9 /dev/block/mmcblk1 /dev/block/mmcblk1p1 /dev/block/platform /dev/block/ram0 /dev/block/ram1 /dev/block/ram10 /dev/block/ram11 /dev/block/ram12 /dev/block/ram13 /dev/block/ram14 /dev/block/ram15 /dev/block/ram2 /dev/block/ram3 /dev/block/ram4 /dev/block/ram5 /dev/block/ram6 /dev/block/ram7 /dev/block/ram8 /dev/block/ram9 /dev/block/vnswap0 /dev/ + ui_print 'Extracting partition table...' + echo 'ui_print Extracting partition table...' + echo ui_print + extract_partition_table + fstab_recovery=recovery.fstab + '[' '!' -e /recovery.fstab ] + fstab_recovery=twrp.fstab + findfs 'PARTLABEL=SYSTEM' + _INSTALL_DEVICE=/dev/block/mmcblk0p18 + '[' '!' -z /dev/block/mmcblk0p18 ] + echo 'install device found at /dev/block/mmcblk0p18' install device found at /dev/block/mmcblk0p18 + export 'INSTALL_DEVICE=/dev/block/mmcblk0p18' + '[' false '=' true ] + findfs 'PARTLABEL=boot' findfs: unable to resolve 'PARTLABEL=boot' + _BOOT_PARTITION= + awk '$1 == "/boot" {print $3; exit;}' /twrp.fstab + _BOOT_PARTITION=/dev/block/mmcblk0p9 + '[' '!' -z /dev/block/mmcblk0p9 ] + echo 'boot partition found at /dev/block/mmcblk0p9' boot partition found at /dev/block/mmcblk0p9 + export 'BOOT_PARTITION=/dev/block/mmcblk0p9' + ui_print 'Unmounting /system...' + echo 'ui_print Unmounting /system...' + echo ui_print + umount_install_partition + awk '$1 == install_part' 'install_part=/dev/block/mmcblk0p18' /proc/mounts + '[' -n '/dev/block/mmcblk0p18 /system ext4 rw,seclabel,relatime,data=ordered 0 0' ] + umount /dev/block/mmcblk0p18 umount: /dev/block/mmcblk0p18: not mounted. ```