Unable to upload sketch to Leonardo

Question

I'm really at my wits end. For a couple of hours I have been programming a custom board that uses everything as on the Arduino Leonardo. A few hours ago I am not able to upload anymore.

I get the following error:

 avrdude: error: buffered memory access not supported. 
 Maybe it isn't a butterfly/AVR109 but a AVR910 device?

I've tried everything from re-installing the IDE, re-installing the board in Device Manager, changing the COM Port. I really just don't know anymore.

Here is some more data that might be relevant or useful:

 Using Port :\\.\COM6 
 Using Programmer : avr109
 Overriding Baud Rate : 57600
 AVR Part : ATmega32U4
 Chip Erase delay : 9000 us
 PAGEL : PD7
 BS2 : PA0
 RESET disposition : dedicated
 RETRY pulse : SCK
 serial program mode : yes
 parallel program mode : yes
 Timeout : 200
 StabDelay : 100
 CmdexeDelay : 25
 SyncLoops : 32
 ByteDelay : 0
 PollIndex : 3
 PollValue : 0x53

[EDIT] I've now checked the battery (yes with a multimeter), it is fully charged, as it charges when the USB is connected. I've also tried a different computer, along with a different USB cable.

• Treesrule14: Did you try telling it to use the incorrect programmer?
• Ricium: Do you mean changing the programmer within the IDE? It is currently set to AVRISP mkll. I've now tried all the alternatives available in the IDE, still no luck.
• Treesrule14: What IDE are you using? Do you have the arduino bootloader installed?
• Ricium: The standard Arduino IDE, tried both 1.0.6 and 1.5.8. And yes, the bootloader is installed as I have previously uploaded sketches to the board

Answer 1

Try this:

First: you must find the COMx used for your "Arduino Leonardo" in the "Device Manager" of Windows.

Second: make double click to see the properties of the device, and go to the "Port configuration tab"

Third: enter in "Avanced Options" and deactivate "Use FIFO buffers", and accept all changes.

• Ricium: Tried it, still nothing. Do you think the bootloader may have caused a random error, or get corrupted or something? - is that even possible. I'll try to reload the bootloader, and see if it works (this part is still new to me), but I would like to know what causes this error? Maybe then I can stop it from happening in the future. Thank you for the reply
• Ricium: Always check if you didn't accidentally blow the crystal! But thank you, checked on another Leonardo board, this worked.