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There is a typo in the code: flash_image recovery /sdcard/xionia_recover.img(it should read /xionia_recovery.img or whatever the exact name of the recovery image is on your sd card. Don't know if you had caught that or not. Hope this is of some useYou don't have the flash_image binary file.
Download the flash_image file from here. Next download ES File Explorer from the market, and go into its settings and at the bottom choose Root Options, then maker sure both checkboxes are checked for Root Explorer and Mount File System.
Next you need to copy and paste the flash_image file you have downloaded from the /sdcard to /system/bin
You copy by long pressing the item, and choosing copy. Then go to the directory you want and press the icon at the bottom of the screen that pulls up the clipboard, and press the copied file to paste it in the directory.
Exit ES file explorer, then use the Terminal Emulator to first set the permissions on flash_image (replace red underlines with spaces, not the black underlines):
chmod_755_/system/bin/flash_image
Next, flash the recovery:
flash_image_recovery_/sdcard/xionia_recover.img
If you get no errors, reboot into recovery:
reboot_recovery
Then follow the steps to backup and wipe cache and finally install
chmod 755 means that you are going to modify file access rights to rwxr-xr-x The first three letters represent the owner of the files permission(the first # in the command,that being 7 in this case),read right execute(rwx). The second three represent the permission of the group associated with the owner of the file(the second # in the command,that being 5 in this case),read - execute(r-x). The third three represent the permission of everyone else(the third # in the command,that being a 5 in this case),read - execute(r-x). If you are getting "read only file system" and you have root access,and have Super Manager,open it up. Go to ROOT section/Enable ROOT function,make sure box is checked. Then click on Select Busybox file,select where busybox is installed(you will need to double check it's location).Scroll down to File Maneger and make sure Top Toolbar is checked and Show Hidden File is checked. Go back to home page of Super Manager and select File Explorer. Hit back button twice and scroll down to system. Click on it, when you do a box will open up,click on r/w. It will say ok.Then scroll down to the flash_image file you installed(make sure it's the correct one by looking at the date/time,it should correspond with the date/time that you installed the flash image. Click on it ,making sure the box has a green checkmark. Go up to the icon's at the top(they scroll right to left and back again.),scroll right to left until you see three red sevens,click on it. A box will open up with the items previously discussed.Click on each box to change it from checked to unchecked.Make sure Owner:all three boxes are checked. Group:read and exec are the only boxes checked. Other:read and exec are the only boxes checked. Then select OK, and you have just changed permission of the flash_image. I had to use this method a couple of times because I or the Terminal emulator was messing up when entering the commands. Using Super Manager was less stressful.yup i tried and it says "unable to chmod /system/bin/flash_image: Read-only file system" what does that mean?
What does jerry mean when he says "Choose mounts and format system, data, and cache" ???