Hello everyone,
I've finally got something ... using TX1 & RX1 which did not have any pin welded on. I welded them and such is the resutL
[ 0 ]Bootloader V2.1
[ 1 ]Boot pin status is 1000
[ 2 ]Jump to flash
[ 3 ]User code length is 25072,code exists flag is 5a
Here are the connections to have such results, using FT232RL for TTL communications
FT232RL ----> LD8001B
3.3V ----> 3.3V
GND ----> GND
RX ----> TX1
TX ----> RX1
LD8001B ----> LD8001B
P19 ----> 2kΩ ----> GND
The LD8001B Pinout is here : http://cartefoi.net/archives/Informatique/pinout.html