SHOULD BE OK FOR : AVIC-F30BT, F930BT, F9310BT, F40BT, F940BT, F840BT, F8430BT
Your TTS language disappeared after installing 2012, 2013 or 2015 map update on your AVIC and you didn't save it before updating ?

Restore it in 3 easy steps...
1. Click on the code of the required language to download it from Dump Truck (java needed) Giga.co.nz :
CZC : Czech
DAD : Danish
DUB : Flemish
DUN : Dutch
ENG : UK English
FIF : Finnish
FRF : French
GED : German
GRG : Greek
HUH : Hungarian
ITI : Italian
NON : Norwegian
PLP : Polish
PTP : Portuguese
ROR : Romanian
SPE : Spanish
SWS : Swedish
TRT : Turkish
2. Extract the downloaded zip file to your SD card without modifying anything.
3. Put the SD in your AVIC and follow directives from this page (thanks to milanatin)
Note 1 : GED, ITI and ROR are still missing for the moment... if you can provide them, please contact me by PM. Thank you Marcello! Now all 18 languages are available...
Note 2 : this topic is "shark free"...
... so I don't want anything but a thank you for this. No forced donations here.