Does anyone know how to update the bootloader on these boards?

use the ATmega328p (old Bootloader) setting. works good for me

I am unable to upload a sketch to all 3 boards.. even when switching to old bootloader, are they bad boards?

I purchased 2 sets of 3ea LAFVIN boards assembled with headers and USB cables August 2020. Using Arduino IDE 1.8.5 could not upload sketch to Nano. Changed Tools->Board=Arduino/Genuino Uno and was able to upload sketch. The Nano thinks it is a Uno. I do not know if there are any other differences.

What voltage battery for these?

Variable. Can connect to USB via mini-USB connecor. Higher voltages up to 9V can connect to power pins

"irremote library by sherriff" compatibility.... having eliminated most other issues, i suspect incompatibility. any btdt or advice?

Sometimes these ship without bootloaders. You will have to flash it yourself if that’s the case. This can be done with a known good Arduino.

Nano V3 0 Nano Board Atmega328p 5v 16m Micro Controller

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🚀 Power your next-gen projects with Nano V3.0 — the microcontroller that means business!

TRIPLE PACK VALUE - Get 3 Nano boards plus USB cables—perfect for multitasking or team projects
ROBUST A TMEGA 328 P MCU - Reliable 5V 16MHz microcontroller powering your innovative projects
ARDUINO IDE COMPATIBLE - Program with ease using the industry-standard Arduino environment
BREADBOARD READY DESIGN - Compact Nano V3.0 fits perfectly for prototyping without clutter
PLUG PLAY USB COMPATIBILITY - Effortlessly integrates with Windows, Mac, and Linux via CH340G driver

The LAFVIN Nano V3.0 is a compact, breadboard-friendly microcontroller board featuring the original ATmega328P chip and CH340G USB interface. Fully compatible with Arduino IDE and major operating systems, it offers a reliable 5V 16MHz platform ideal for prototyping and embedded development. This triple-pack bundle includes USB cables, delivering exceptional value for makers and professionals alike.

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I**H

13.01.2026

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12.01.2026

G**Y

17.04.2025

Z**A

15.12.2025

A**Y

11.04.2025

D**M

25.08.2019

B**R

2.11.2025

R**T

26.02.2020

J**.

23.07.2024

S**.

16.10.2023

M**D

3.08.2024

C**A

8.10.2023

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4733 som

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ASIN	B07G99NNXL
Best Sellers Rank	#636 in USB Cables
Brand	LAFVIN
Compatible Devices	Personal Computer
Customer Reviews	4.6 out of 5 stars 2,242 Reviews
Hardware Interface	USB
Item Weight	0.2 Ounces
Manufacturer	LAFVIN
Mfr Part Number	LA-020
Model Number	8541582500
Operating System	Linux,Mac,Operating,Windows
Style	Classic
Style Name	Classic
UPC	781520418697
Unit Count	3.0 Count

Nano V3.0, Nano Board ATmega328P 5V 16M Micro-Controller Board Compatible with Arduino IDE (Nano x 3 with USB Cable)

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