Install company's wireless certificate to Samsung Android 4.0.3. tablet Trying to install all exported windows WEP Enterprise 802.1X Wireless certificates (.p12 extension) to a Samsung Android 4.0.3 tablet. With no certificate installer, Android certificate was installed from Google Play on the Tablet. The certificate file was opened, however, the error “No Certificates to Install” was displayed.
I had an issue with something similar a few years back - and I believe this thread helped (see Lynx's post about halfway down).  (I know it's a bit old - but I remember it being very helpful).

I believe the certificate also needs to be very generically titled "certificate.p12" or something like that (if I recall correctly).

Make sure it's in the root of your SD card and that you're trying to install from Settings >> Security >> Install from SD card.

You can also try and use this tool (not sure how secure it is - but it might help).