不知道有沒有人有遇到這樣的問題link too many cydia account
可能都沒有人知道cydia有這個限制，但是就在今天我遇到了
剛好查了一些文章，如果有人也遇到可以看一下

Cydia Store licenses currently do not have absolute device limits -instead there is a rate limit,
which means that you may not be able to add additional devices right away, but if you wait,
you will be able to add more devices.
意思是說cydia其實是沒有明確的限制，但是在短時間之內不能連結太多device
遇到了只要等一陣子就可以再連結其他裝置，大概要幾個禮拜的時間吧
也不要寫信給saurik，因為他大概也沒有空回你

You can't currently unlink a device from a Cydia ID. After you restore a device and sell it (for
example), the new user can jailbreak it and then install existing Cydia purchases associated
with that device, but they have absolutely no access to your Google/Facebook/Amazon/PayPal
accounts or other personal information.
目前也沒辦法從cydia中unlink device，唯一的辦法就是重新JB