Source: http://www.elecfreaks.com/7281.html

We may often encounter such situation as bootloader falls off when using Arduino, this thing can freak us out especially when we got no bootloader tools on hand. So what shall we do? Here we’ll introduce a way on how to burn bootloader via Arduino, which is rather practical in cases when without bootloader burning tools and no extra Arduinos.

Step 1: Preparation

<p>Here's asking for a miracle.. I have an R2 UNO and a MEGA-2560. the 2560 acts as it if is losing its marbles. (becomes unrecognizable by a Linux install of 1.0.5 &amp; 1.0.6, despite the 'canonical' release for linux is 1.0. the MEGA wants a odd TTY address, other than /dev/ttyUSB0 , and 80% of the time, it requires disconnecting, re-connecting, a few times, before the IDE will talk to it.) Could I pull-off a reload of the 2560's bootloader, using the UNO?</p>

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