[Galaxy S 4 Q&A, Help & Troubleshooting] jcodde:
Hi, like Jccurran.jc, I am a new comer to the Android world and delighted to have a S4. Having rooted my phone, I am starting to explore what custom ROMs have to offer. In this staged process, I am now keen to get Recovery on my phone but despite my readings still have a number queries that I would be grateful for someone to help me understand. All of these are based on the premise that you must have custom recovery on your phone before moving to installing a custom ROM on it. The specific questions I have are:

Am I correct in understanding that "custom recovery" is merely the means of installing a ROM to return to should the installation of a custom ROM go wrong?

If this is the case, why can't your Stock ROM achieve this fall-back role?

There seem to be several ways of installing a custom Recovery whether it be via TWRP, ClockWorkMod and Philz CWM. These all seem to achieve the same objective but use different custom recovery file formats whether they be zip, taz or image files. However, is the method of choice largely a personal one and once the custom recovery file is in place, it doesn't make any difference when you move on to installing a custom ROM or are you now locked into a set way of installing a Custom ROM?

All guides to undertaking installation of a custom recovery stress the importance of backing up your phone (which is a little confusing to a new comer as I have Titanium Backup Pro but can't backup my ROM until I have Recovery in place?). I have done what I can but note that some sites recommend using EFS Prossional to backup my phone's EFS settings folder that contains very critical phone specific information that include IMEI (encrypted in the nv_data.bin), wireless MAC addresses and product code. While I can't be certain that this doesn't happen with Apps like My Backup Pro or Helium, it seems very sensible to help avoid bricking my phone but the program itself requires BusyBox v1.20.2, not the current version in Google Play Store which is more recent but as the developer states is less stable than the older version (and with which EFS Professional wont work). Despite my best attempts to locate the older version as a APK file I haven't been able to as most links point to crap or seem to be for inclusion in custom ROMs (but this may reflect my lack of understanding of the Android system). Can anyone help me understand this and point me to a site where I can obtain the necessary version of BusyBox to enable me to run EFS Professional?

Some sites, including one of the responders to this thread, point out the importance of staying with your phone's offical firmware so that the modem and other hardware components of your phone continue working properly. I have purchased an unlocked international GT-I9595 phone via an internet store that has the baseband version I9505ZHUAME1. Should I my custom recovery file be the same (or its more recent release) or can I use an international LTE variant file such as "CF-Auto-Root-jflte-jfltexx-gti9505.zip"? Obviously, living in Australia, I am not wedded to the Hong Kong based ROM that is native to my phone.

If the answer to the previous question is to stay with the phone's native ROM, then this may force me away from TWRP as it doesn't believe there is any Recovery files available for my phone. Does this fit with other people's experience?

Many thanks in advance for any responses as I totally agree with another responders to this thread (FlOYD') advice: "

Make sure you understand what you are doing

!". :confused: