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

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

Product ID: 257519460

Details

Brand
LAFVIN
Compatible devices
Personal
Hardware interface
USB
Item weight
0.2 Ounces
Style
Compact

⚡5V Operating Voltage

🔌CH340G USB Interface

🧠ATmega328P MCU

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Description

🚀 Power your innovation with the ultimate compact Arduino Nano trio!

TRIPLE PACK VALUE - Get 3 Nano V3.0 boards with USB cables—ideal for multitasking or team projects.
ENHANCED CH 340 G CHIPSET - Upgraded from FT232RL for faster, more reliable USB communication.
ROBUST USB ISP PROGRAMMING - Supports USB and ISP downloads for versatile coding and debugging.
COMPACT BREADBOARD FRIENDLY DESIGN - Smaller than Arduino UNO, perfect for sleek, space-saving projects.
SEAMLESS CROSS PLATFORM COMPATIBILITY - Flawlessly works with Windows, Mac, and Linux for ultimate flexibility.

The LAFVIN Nano V3.0 is a compact, breadboard-friendly microcontroller board powered by the original ATmega328P MCU and upgraded CH340G USB interface. Fully compatible with Arduino IDE and major operating systems, it supports USB and ISP programming, operates at 5V logic level, and comes in a convenient 3-pack with USB cables—perfect for professional developers and makers seeking reliable, versatile, and space-efficient hardware.

Specifications

ASIN	B07G99NNXL
Best Sellers Rank	#165,842 in Computers ( See Top 100 in Computers ) #10,842 in USB Cables
Brand	LAFVIN
Compatible Devices	Personal Computer
Customer Reviews	4.6 4.6 out of 5 stars (2,103)
Hardware Interface	USB
Item Weight	0.2 Ounces
Manufacturer	LAFVIN
Mfr Part Number	LA-020
Model Number	8541582500
Operating System	Linux
Style Name	Compact
UPC	781520418697
Unit Count	3 Count

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