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  1. Hello, everyone! I have an S905M device (Sumavision Q5, RAM:1G, ROM:8G), I made a bootable USB with an Armbian image( ARMBIAN 5.44 user-built Ubuntu 18.04.5 LTS 3.14.29, use gxbb_p201.dtb file ) . I want to use "ddbr" then “b” to make a backup of the EMMC. However, root@SumavisionQ5:~# ddbr DO YOU WANT TO BACKUP OR RESTORE ? BACKUP=(b) RESTORE=(r) b UNABLE TO FIND ANY EMMC OR SD DRIVES ON THIS SYSTEM!!! then I use command "lsblk", I found all partitions(cache, params, ... , data) of the internal storage (8G ROM) for andriod system are treated as seperated disks as shown below: root@SumavisionQ5:~# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 1 14.9G 0 disk |-sda1 8:1 1 128M 0 part /boot `-sda2 8:2 1 14.6G 0 part / cache 250:0 0 512M 0 disk params 250:1 0 64M 0 disk logo 250:2 0 32M 0 disk recovery 250:3 0 32M 0 disk rsv 250:4 0 8M 0 disk tee 250:5 0 8M 0 disk crypt 250:6 0 32M 0 disk misc 250:7 0 32M 0 disk instaboot 250:8 0 512M 0 disk boot 250:9 0 32M 0 disk system 250:10 0 1G 0 disk data 250:11 0 4.9G 0 disk zram0 253:0 0 100.9M 0 disk [SWAP] zram1 253:1 0 100.9M 0 disk [SWAP] zram2 253:2 0 100.9M 0 disk [SWAP] zram3 253:3 0 100.9M 0 disk [SWAP] use armbianmonitor -u, a detail info is uploaded in http://ix.io/2vPI From that, I find something the 8G ROM is in NAND instead of in EMMC : [ 6.263857] nandphy: Nand PHY Ver:XXX.XXX.001.0006 (c) 2013 Amlogic Inc. [ 6.270503] nandphy: ######STS IRQ mode for nand driver [ 6.275794] nandphy: NAND device id: 2c 64 44 4b a9 0 0 0 [ 6.281261] nandphy: detect NAND device: B revision NAND 8GiB MT29F64G08CBABA [ 6.340701] nandphy: clk_reg = 81000244 [ 6.343380] nandphy: bus_c=6,bus_t=7,sys=4.0ns,T_REA=16,T_RHOH=15 [ 6.347931] nandphy: new oob mode [ 6.352301] nandphy: NAND CKECK:arg nbbt:arg_valid=1,blk_addr=5,page_addr=0 [ 6.361720] nandphy: NAND CKECK:arg ncnf:arg_valid=1,blk_addr=4,page_addr=0 [ 6.382065] nandphy: NAND CKECK:arg phyp:arg_valid=1,blk_addr=8,page_addr=1 [ 6.402285] nandphy: NAND CKECK:arg nkey:arg_valid=1,blk_addr=9,page_addr=0 [ 6.432194] nandphy: NAND CKECK:arg ndtb:arg_valid=1,blk_addr=7,page_addr=33 [ 6.462225] nandphy: NAND CKECK:arg nenv:arg_valid=1,blk_addr=10,page_addr=9 [ 6.469413] nandphy: nfboot : [ 6.472338] nandphy: off:0x000000000000-0x000000800000 :partn=0:single_chip single_plane [ 6.478386] nandphy: nfcache : [ 6.481817] nandphy: off:0x000006800000-0x000029000000 :partn=2:single_chip multi_plane [ 6.489940] nandphy: nfcode : [ 6.493390] nandphy: off:0x00002f800000-0x000077000000 :partn=9:single_chip multi_plane [ 6.501481] nandphy: nfdata : [ 6.504948] nandphy: off:0x0000a6800000-0x000159800000 :partn=1:single_chip multi_plane How I can do it? Could command “ddbr” make a backup of NAND flash? OK! As far as I know,command “ddbr” can not make a backup of a andriod system in NAND flash. ________________________________________ Background................................................... I also have a device (Tianyi, TY1208-Z, RAM:1G, ROM:8G) with S905L, and I have successfully made a backup file of EMMC. The EMMC is normally recognised as shown below: root@aml:~# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT mmcblk0 179:0 0 1.9G 0 disk |-mmcblk0p1 179:1 0 128M 0 part `-mmcblk0p2 179:2 0 1.7G 0 part mmcblk1 179:32 0 7.3G 0 disk |-mmcblk1p1 179:33 0 122M 0 part /boot `-mmcblk1p2 179:34 0 6.5G 0 part / mmcblk1boot0 179:64 0 4M 1 disk mmcblk1boot1 179:96 0 4M 1 disk zram0 253:0 0 50M 0 disk /var/log zram1 253:1 0 417M 0 disk [SWAP]