# New Arduino Nanos won't load

**URL:** <https://forum.arduino.cc/t/new-arduino-nanos-wont-load/1354316>\
**Category:** General Guidance\
**Created:** [February 15, 2025, 5:06pm UTC](https://forum.arduino.cc/t/new-arduino-nanos-wont-load/1354316 "2025-02-15T17:06:53Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![van\_der\_decken](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/van_der_decken/32/1006976_2.png) [@van\_der\_decken](https://forum.arduino.cc/u/van_der_decken)\
**Post date:** [February 16, 2025, 5:56pm UTC](https://forum.arduino.cc/t/new-arduino-nanos-wont-load/1354316/21 "2025-02-16T17:56:08Z")

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If you've loaded up the board via ICSP, it doesn't have a bootloader anymore.

Since you've gotten that far, I'd suggest installing the [MiniCore core](https://github.com/MCUdude/MiniCore) which has support for the 328PB, and burning the 328PB bootloader (with UART0 selected). Then you can use the board normally through the IDE. _Almost_. You won't select Arduino Nano as the board anymore, but MiniCore, ATmega328, 328PB variant.

Just a note for the future: I'd advise against trying to use Wire1 though, until you verify that SDA1 and SCL1 aren't simply tied to ground and 5V respectively (as they would be with a PCB designed for a 328P). I imagine it's unlikely you'd be able to use Wire1 in any case (unless the PCB has the pins brought out somewhere), but enabling those 2 pins as outputs with them tied to power... ouch.

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<div class="post-metadata">

**Author:** ![RichardDL](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/richarddl/32/1098606_2.png) [@RichardDL](https://forum.arduino.cc/u/RichardDL)\
**Post date:** [February 20, 2025, 3:21pm UTC](https://forum.arduino.cc/t/new-arduino-nanos-wont-load/1354316/22 "2025-02-20T15:21:22Z")

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Success! I've followed the instructions in post #21 and now I can load one Nano (alleged) normally from the IDE and direct com port. I should be able to try the other in a week or two. Thanks @van_der_decken and everyone for your comments.

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<div class="post-metadata">

**Author:** ![van\_der\_decken](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/van_der_decken/32/1006976_2.png) [@van\_der\_decken](https://forum.arduino.cc/u/van_der_decken)\
**Post date:** [February 20, 2025, 4:57pm UTC](https://forum.arduino.cc/t/new-arduino-nanos-wont-load/1354316/23 "2025-02-20T16:57:56Z")

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I'm happy to hear that you got it working. Have fun!

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<div class="post-metadata">

**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [August 19, 2025, 4:58pm UTC](https://forum.arduino.cc/t/new-arduino-nanos-wont-load/1354316/24 "2025-08-19T16:58:38Z")

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