September 12th, 2012, 04:19 PM
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Cannot backup system in ematic 7" tablet?
I am stymied where I shouldn't be.
I have this ematic eGlide 2.2 e-book reader with the nefarious RK2818 chipset. This means that I cannot permanently root it unless I re-flash the ROM. Of course, I want to back up the old ROM before proceeding. So here is what I tried:
1) Use SuperOneClick to gain root through psneuter. WORKS!
2) The expected: mount -o remount,rw /dev/block/mtdblock4 /system
Fails -- because /system is a cramfs file system, and thus always R/O.
3) The unexpected: cat /dev/block/mtdblock4 > /sdcard/mtd4_system.img
As root, I can naturally access /dev/block/mtd*, but the copy process stops when the sdcard is full (4GB), although I *know* that mtd4 has only 272 MB.
4) dd if=/dev/block/mtdblock4 of=/sdcard/mtd4_system.img
Same effect. Can anybody point me in the direction of why the copy process doesn't stop at end-of-file?