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  • Embedded devices are often very non-standard. Commented Jun 11, 2017 at 20:34
  • First, you have to find out, how what parts of the file system are mounted. What does mount say? Typically there will be a way to mount then writable as developers of the system need then writable during development and debugging, but they sometimes make it hard to figure out. Commented Jun 12, 2017 at 4:43
  • Embedded devices often have read-only filesystems; sometimes they have an overlay filesystem which allow you to make changes, but only in some subdirectory trees. Look at mount, cat /proc/mtd etc. Commented Jun 12, 2017 at 9:49
  • i typed: mount and cat /proc/mtd please check the edit part in the question Commented Jun 12, 2017 at 18:24
  • mr @Philippos i did as you told me, can you please tell me what to do next ? Commented Jun 14, 2017 at 15:15