Rooted w/ no R/W options - Xperia Z3v General

I posted this in the wrong thread earlier... Apologies
I rooted my Z3v with Kingroot (I'm beginning to think that was a mistake). I seem to have "limited" root capabilities. I cannot install BusyBox because R/W permission fails. I run root checker and get positive results. Also, I cannot make any changes to the phone's root or install a recovery. Is there a way to fix this? If not, how do I start from the beginning and get rid of Kingroot in exchange for SU and a recovery?

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Install SuperSU from play store and install it's binary, and uninstall all kingroot apps after and reboot phone. Done.

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Binary won't install.
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Sent from my D6708 using Tapatalk

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Same exact issue
Hey, just wanted to say that I'm having an identical issue regarding r/w issues after kingroot and SuperSU Binaries won't install. I'm a newbie to rooting but my Z3v D6708 has no data connectivity through USB Debugging (hardware damage) so this was my only option. I have however been experimenting with doing a kingroot uninstall from within the king user app, then rooting using kingo root (different website entirely from KingRoot) then I rerooted with kingroot (to make it stick? I had to kingo root after every reboot) and that got me some slightly updated SU Binaries that allowed xposed to install and some modules to function. I would love for someone with more knowledge to do some research into this and fix the R/W issue though. Thanks in advance to anyone who tries to help!

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Savetheknot said:
I posted this in the wrong thread earlier... Apologies
I rooted my Z3v with Kingroot (I'm beginning to think that was a mistake). I seem to have "limited" root capabilities. I cannot install BusyBox because R/W permission fails. I run root checker and get positive results. Also, I cannot make any changes to the phone's root or install a recovery. Is there a way to fix this? If not, how do I start from the beginning and get rid of Kingroot in exchange for SU and a recovery?
Click to expand...
Click to collapse
I was having read/write issues and believe I solved this with the Advanced Tools App, Settings and Root, SD card write access. Play around with the switches in that section and one of them seemed to do the trick for me.

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In SU is there still the "fix permission" option?
Looks as if I didn't remember right, it seems "fix permission" is in the ROM manger etc.... CWM, TWRP.

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Savetheknot said:
I posted this in the wrong thread earlier... Apologies
I rooted my Z3v with Kingroot (I'm beginning to think that was a mistake). I seem to have "limited" root capabilities. I cannot install BusyBox because R/W permission fails. I run root checker and get positive results. Also, I cannot make any changes to the phone's root or install a recovery. Is there a way to fix this? If not, how do I start from the beginning and get rid of Kingroot in exchange for SU and a recovery?
Click to expand...
Click to collapse
Better use prerooted firmware by installing recovery