can t switch my mx4 to rc-proposed

hi folks,
i d like to switch to rc-proposed for help the community by using latest release and find bugs, but it seems i just can switch to rc-proposed what ever solution i used.

when i do:nocomp@up-yours:~$ sudo system-image-cli -vvvv --switch ubuntu-touch/rc-proposed/meizu.en


i always end with the same error:

File "/usr/lib/python3/dist-packages/systemimage/main.py", line 336, in main
list(state)
File "/usr/lib/python3/dist-packages/systemimage/state.py", line 129, in __next__
step()
File "/usr/lib/python3/dist-packages/systemimage/state.py", line 500, in _download_files
self.downloader.get_files(downloads, pausable=True)
File "/usr/lib/python3/dist-packages/systemimage/download.py", line 296, in get_files
raise TimeoutError
TimeoutError
[systemimage] Aug 13 08:38:55 2015 (8238) state machine finished

and then if i use the other method: ubuntu-device-flash touch --channel ubuntu-touch/rc-proposed/meizu.en

the script always freeze after pushing this archive:



2015/08/13 08:42:53 Device is |arale|
2015/08/13 08:42:54 Flashing version 87 from ubuntu-touch/rc-proposed/meizu.en channel and server https://system-image.ubuntu.com to device arale
2015/08/13 08:42:54 Start pushing /home/nocomp/.cache/ubuntuimages/ubuntu-touch/rc-proposed/meizu.en/arale/version-87.tar.xz to device
2015/08/13 08:42:54 Start pushing /home/nocomp/.cache/ubuntuimages/gpg/image-master.tar.xz to device
2015/08/13 08:42:54 Start pushing /home/nocomp/.cache/ubuntuimages/gpg/image-signing.tar.xz to device
2015/08/13 08:42:54 Done pushing /home/nocomp/.cache/ubuntuimages/gpg/image-signing.tar.xz to device
2015/08/13 08:42:54 Done pushing /home/nocomp/.cache/ubuntuimages/gpg/image-master.tar.xz to device
2015/08/13 08:42:54 Done pushing /home/nocomp/.cache/ubuntuimages/ubuntu-touch/rc-proposed/meizu.en/arale/version-87.tar.xz to device
2015/08/13 08:43:02 Start pushing /home/nocomp/.cache/ubuntuimages/pool/custom-fadff4f3d71eed42896bcca9db45a3f44b8c7ed8f6c58a15df c0ff9b63d1b446.tar.xz to device
2015/08/13 08:43:02 Start pushing /home/nocomp/.cache/ubuntuimages/pool/device-3fbcd1afad4d6964d76f9e43587a92c9b6b206bb7df2c41951 371e09fd9d14ec.tar.xz to device
2015/08/13 08:43:17 Start pushing /home/nocomp/.cache/ubuntuimages/pool/ubuntu-dcf6a5e745ce46aff22add18c8cd2f21b4811a62383f857c0f 955a74d2ac866a.tar.xz to device
2015/08/13 08:43:27 Done pushing /home/nocomp/.cache/ubuntuimages/pool/custom-fadff4f3d71eed42896bcca9db45a3f44b8c7ed8f6c58a15df c0ff9b63d1b446.tar.xz to device


so i ve removed all cache file, same issue, reset the phone, same issue,
so how can i proceed for install a nightly build, any help truelly appreciate
thxxxx