text: What is a "Bootloader" ?
  
  What is "stk500" ?
  
  What is "avrdude" ?
  
  What symptoms indicate a bootloading problem?
  
  What are common causes of bootloading problems?
  
  What information can I collect to debug a bootloading problem?
  
  Can my Arduino have the bootloader damaged?
  
  How can I tell if my bootloader is damaged?
  
  Why else would I want to upload a new bootloader?
  
  Can I replace or upload a new bootloader with no additional equipment?
  
  How can I replace or upload a new bootloader?
  