Hi - I do have a serious issue. My nybble sends a beep code, which I cannot find in documentation. It beeps 5 time with a short a deep sound, than a longer higher beep. In addition my FTDI 232 is not able to upload codes on board any longer. Might my board have a defect?

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EDIT : for those, that want to have a shortcut of this long thread (as solved).

As per combined investigation, this "failure" was mainly based on three issues:

A) step down circuit on NyBoard

Metal servos had a undervoltage issue causing strange movements. Also YELLOW led start blinking and stopping all servos, in case all servos were running at once. This could be solved, by a bypass of the step down circuit, which improved behaviour of METAL SERVOS (!) a lot.

see post: https://www.petoi.com/forum/hardware/reconfigure-nyboard-v0-1-for-pro-users

CAUTION: For METAL SERVOS ONLY - do NOT use for plastic gear servos - it will damage servo!!

B) Type of Li-Ion battery

My PROTECTED batteries did not work and caused these strange movements while calibration. I guess, this is one of the MAIN root causes.

see : "report your batteries" in this post , please.

C) Damaged FTDI

Most likely, due to these unexpected movement caused by A) & B), legs where blocked and might have caused a damage on the FTDI232 board. They are cheap - a new one worked.

With combinition of:

- new FTDI I was able to re-upload sketch on board again

- step down circuit modification, my servors did not any longer stopped moving while combined power consumption (hint: use sketch "moduleTests.ino" to test all servos at once. Type "1"-"4" on IR remote to see effect on board)

- new batterie without protection, this problem should be finally solve this issue completely (in progess - new batteries are ordered). As per feedback and hardware tests of Rongzhong Li this should work (see his video).

I appreciate all you support! This was "Murphy´s Law" on his best ...