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.

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

Product ID: 72633833

Details

Brand
LAFVIN
Compatible Devices
Personal
Hardware Interface
USB
Item Weight
0.2 Ounces
Style
Classic

⚡16MHz clock speed for fast processing

🔌USB CH340G interface for seamless connectivity

🧩Compact, breadboard-friendly form factor

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C$2017

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Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 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.

Specifications

ASIN	B07G99NNXL
Best Sellers Rank	#488 in USB Cables
Brand	LAFVIN
Compatible Devices	Personal Computer
Customer Reviews	4.6 out of 5 stars 2,237 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

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