I have a 2012 Kindle Fire HD and a fastboot factory cable. I originally used the KFHD System.img Restore Tool today and flashed a pre-rooted 7.4.8 image on my Kindle Fire HD. I wanted the Playstore so I tried Option 2 but when the system came up I couldn't activate WiFi. I tried Option 1 and WiFi worked. I wanted Playstore so I tried both 7.4.9 and 7.3.0 with Option 2 but no WiFi at all so I put 7.4.9 Option 1 on. I then followed a guide to put the Playstore on and it worked and then I tried to put the Amazon Kindle app on for my books but it said it was already installed but it wasn't available in the Apps section. I couldn't uninstall it as there wasn't an option for it so I couldn't reinstall. I decided I just wanted to put a custom ROM on like CM11 so I followed a guid and installed a 2nd boot loader and TWRP. I rebooted into TWRP and tried to mount it but it wasn't working so I exited out of TWRP, rebooted and connected my normal cable and started copying CM11 over to the Kindle so I could install it but my Kindle restarted and during boot it said updating and when it came back up I no longer had root any more. I have now been trying to redo it with KFHD Restore Tool but now of the version numbers are giving me WiFi.
Can someone please walk me through rooting and installing a custom ROM with my fastboot cable. I have tried so many guides and done so many thinks to my PC and am not sure where to go now. Could someone walk me through start to finish on exactly what to do since I do have a fastboot factory cable? Thanks in advance.