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Is it safe to install a custom ROM on a S3 with a non-functional volume down key?

What should I circumvent or be ware of during the install?

p.s: the key cannot be repaired.

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    You might be able to get it into the right mode with adb reboot recovery or adb reboot bootloader. – Naftuli Kay Jul 10 '14 at 16:49
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    Additionally to adb, Samsung phones can be forced into 'download mode' through a USB jig, and therefore gets you to a state where you can flash whatever you need over Odin/Heimdal/KEIS/etc. You can purchase them online for cheap or make your own. Just something to note. – filoxo Jul 11 '14 at 22:14
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Without a volume-down key, you can't:

  • go into recovery mode/download mode without a PC
  • reduce the volume (duh)
  • select options in CWM
  • take screenshots in AOSP-based ROMs

Possible workarounds, by order of mention above:

  • use adb reboot recovery / adb reboot bootloader, as said in the comments
  • use a USB jig to force the phone to boot into Download Mode
  • go into Settings > Sound > Volumes and change values from there
  • use TWRP or CWM Touch instead
  • use third-party apps. I think GravityBox for Xposed has the option to add a screenshot option and advanced reboot to the power menu, but I haven't been using Xposed for a long time.
  • Having used GravityBox for a long time, you can also enable a setting to have "Recovery" and "Bootloader" as options to reboot to; that way you don't actually need a PC. There is a Volume toggle in QS options as well. – filoxo Jul 11 '14 at 22:19

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