I upgraded my player to B13 and and I wanted to update My kernel to v286.
Jemplode tells me that I need to have ethernet to do the Upgrade.

Jemplode can only upgrade the player via ethernet if Hijack is already installed.

By installing Beta 13, you have erased Hijack.

So, after installing Beta 13, you can only use serial to install Hijack, using the proper kernel-flashing software (such as my logo editor).