The support service promised a solution from R&D after I sent log files, but the solution did not come. However, the application also failed when I selected just a tiny chat to be recovered/merged into the target iPhone. I first thought that the problem was caused by the backup file being too big. Another error indicated that WhatsApp should be active in the target phone, when it was already activated. One error/tip asked me to disable Find My iPhone, which I did. This time the error messages were more informative, but weird or not real. I tried also first making a local backup from one phone to the computer and then restoring/merging a few chats in the other phone, which again did not work. It installed fine, but when I tried to transfer and merge chats directly between two iPhones it failed after many attempts, showing at the end an 'unsolvable error' message. I bought a license of Syncios WhatsApp Transfer application for Mac OSX. My advice : just try it and you won't be able to do without it. There’s no limit ! If you ever tried to experience iTunes for the same purpose, then you will see the difference ! Syncios is definitely the smartest way to transfer data from laptop to iPhone and forget about the complexity and heaviness of iTunes. You can even backup and restore all data from your iPhone, or restore it to another iPhone. You can also remove any piece of music or all music from your smartphone, with only one click ! Same with photos, notes, etc. You just need to connect it to your laptop, select the folder(s) where music is stored and click 'Transfer', then it is quickly uploaded to the smartphone. Should you wish to upload and listen to your favorite music from an iPhone, there's nothing simpler. Data can be either photos, music, notes etc. As opposed to iTunes, which may sometimes result in losing data, Syncios is a smart, secure and user friendly piece of software allowing easy data transfer from laptop to iPhone and reverse. I discovered Syncios Mobile Manager a few years ago, after experiencing iTunes which turned out to be a real nightmare to me (and most users that I know).

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