Review on Gratux Atmega328P-PU Bundle - Bootloader Enabled (Pack of 2) with Convenient Sockets by Mike Modesto

I bought these for a battery powered portable device I was wanting to make and intended to run it with an 8MHz internal oscillator. When I received them I tried unsuccessfully to flash my code onto one chip and tried another suggesting I may have received a dead chip, but the other chip also failed to flash. It turns out that the default backup configuration requires an external clock to boot, so without it the chip can't boot and you can't flash it. I ended up having to set up an external clock to start the chip and while it was running with that clock I was able to reset the fuses to use the internal 8MHz oscillator. After that I was able to run the chip without the clock and flash my code. Once I figured that out and ran them both worked great. The sockets that come with it are nice too.