Hi Rongzhong, I have purchased my Bittle (pre-assembled kits) from Amazon. Although there was a $50 premium, it was the most convenient and quickest option for me. They appear to the the SeedStudio versions (Petoi Bittle - Bionic Open Source Robot Dog (seeedstudio.com)). However, this version that I received appears to be missing the feet-covers/socks. Unsure if it's missing any other parts too. Is there any way you can please send me some? I can pay it it and the shipping if required. I would like to test the Bittle behavior with and without the socks. Can you please assist? Thanks much in advance. Regards

Hi Rongzhong, Great job with this robot. Your passion and dedication towards this project is incredible indeed. I have purchased a few of your kits and so far it's worked out great. I also believe you and your team have done a great job with the assembly, coarse/fine-calibration instructions. Can you please share some sample code as an example for climbing up and down a step? I see it in one of your videos, but the standard instincts and any posted newbilities don't have an example to make the Bittle climb up and down step that's 0.5" in height, for example. If there there is some basic Arduino code that you can share, that'll really help me get started on writing some code to improve on this behavior. Any assistance is greatly appreciated.