jtag option

Is there any possibility to use jtag and flash New units without com port communication? The lack of com port support, is rather annoying on New hardware, du to boards acting wired. This week, i had a 1200, With no link at poe - boot port (ether 10), and connecting to another port, showing kernel panic.. A way to flash this. would be nice. bbut today harware. dont give the opperunity to do this. Annoyonw have anny information about jtag on mikrotik Board? and is it possible to flash trough this?