Flashing via ISP

[dounix]

I bought a einsy-rambo directly from ultimachine to use while prusa took their time sending me a replacement board. It worked fine with prusa 3.1.3, but 3.2.0 doesn't seem to fit, so I was trying to put the prusa bootloader on it via ISP.

I can't seem read/write the flash(for changing bootloader) on my einsy-rambo 1.1a via ISP.

The schematics show the bottom half of J19 used for ISP, verified gnd/vcc pins before attempting.
Sheet 5 of https://github.com/ultimachine/Einsy-Rambo/blob/1.1a/board/Project%20Outputs/Schematic%20Prints_Einsy%20Rambo_1.1a.PDF

Using avrdude and a USBASP programmer(double checked the programmer on a few of AVR dev boards I have around)

Tried using power from the programmer, and externally powered(with power disabled on the programmer of course)

avrdude fails to get a device signature all 0's when powered by the programmer, all f when externally powered.

All connectors are unplugged, only the ISP plugged in.

Wanted to ask is there Is there a trick to getting it to program?
Jumpers or pullups/downs on miso/mosi?

[darkdelphi]

I have the same exact issue. I was able to get a previous RC1 build to work at one point but accidentally deleted it. I went back to 3.13 for some reason I can't remember but now I can't get any of the 3.2 versions to work constantly getting mismatch errors

[tonokip]

@dounix
The reset signal on J19 is inverted. If you use the one on the P2 header it should work.

@darkdelphi
Regarding mismatch errors, I believe this could be due to a changes in the prusa-stk500v2 bootloader versus the Arduino Mega version. The mismatch seems to happen when trying to use close to ~96%+ of the flash space.

[patelmontu]

I bought a einsy-rambo 1.1b directly from ultimachine to use in my custom made printer.
As per ultimachine website A preconfigured Marlin Firmware is preloaded onto the board But when I connect the board with RepRapDiscount Full Graphic Smart Controller its just blank no light nothing and I check the power led is on.
And I just swep the EXP1 and EXP2 cable then LCD light is on but blank.

So how to find which firmware is preloaded and which configuration.

I just try to upload new firmware from Ultimachine Github (https://github.com/ultimachine/Marlin/tree/Einy-Rambo/Marlin) using Aurduino 1.8.7 I got the error massage (Arduino: 1.8.7 (Windows 10), Board: "RAMBo"

Sketch uses 94090 bytes (36%) of program storage space. Maximum is 258048 bytes.
Global variables use 4595 bytes of dynamic memory.
Error opening serial port 'COM15'. (Port busy)
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer
An error occurred while uploading the sketch

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.)

I need Help.

Regards,
Mayank .