Finally, reflashing again fixed those problems.
But now, on v1.71, the cam still doesn't seem to work (same error with VLC)
[ 456.055480] usb 2-2: new high-speed USB device number 2 using ehci-omap
[ 456.247436] usb 2-2: New USB device found, idVendor=045e, idProduct=0772
[ 456.247467] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 456.247467] usb 2-2: Product: Microsoft® LifeCam Studio
[ 456.247467] usb 2-2: Manufacturer: Microsoft
[ 456.261474] generic-usb 0003:045E:0772.0001: hidraw0: USB HID v1.01 Device [Microsoft Microsoft® LifeCam Studio] on usb-ehci-omap.0-2/input4
[ 457.245697] media: Linux media interface: v0.10
[ 457.311187] Linux video capture interface: v2.00
[ 457.311187] WARNING: You are using an experimental version of the media stack.
[ 457.311218] As the driver is backported to an older kernel, it doesn't offer
[ 457.311218] enough quality for its usage in production.
[ 457.311218] Use it with care.
[ 457.311218] Latest git patches (needed if you report a bug to linux-media@vger.kernel.org):
[ 457.311218] b250392f7b5062cf026b1423e27265e278fd6b30 media: ttpci: fix av7110 build to be compatible with CONFIG_INPUT_EVDEV
[ 457.311248] 85c1abcb5251673d18325576f4923bb78af479de usbtv: Make it dependent on ALSA
[ 457.311248] 66cae53024c4b73d40b4e78c557a73e082522aed media: fix au0828 dvb suspend/resume to call dvb_frontend_suspend/resume
[ 457.373443] uvcvideo: Found UVC 1.00 device Microsoft® LifeCam Studio (045e:0772)
[ 457.434326] input: Microsoft® LifeCam Studio as /devices/platform/usbhs-omap.0/ehci-omap.0/usb2/2-2/2-2:1.0/input/input9
[ 457.436523] usbcore: registered new interface driver uvcvideo
[ 457.436553] USB Video Class driver (1.1.1)
[ 458.797882] 2:3:1: cannot get freq at ep 0x82
[ 458.865844] usbcore: registered new interface driver snd-usb-audio
[ 480.219573] usb 2-2: USB disconnect, device number 2