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

⚡5V stable power supply

💻Full OS compatibility (Win/Mac/Linux)

🔌CH340G USB interface for seamless programming

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Elevate your DIY projects with the Nano V3.0 – power, precision, and portability in one sleek board!

TRIPLE PACK VALUE - Get three Nano V3.0 boards plus USB cables—ideal for multitasking projects or team collaboration.
NEXT GEN USB INTERFACE - Upgraded CH340G chip replaces FT232RL for faster, smoother USB communication.
PLUG PLAY POWERHOUSE - Runs on original ATmega328P MCU with reliable 5V power for consistent performance.
CROSS PLATFORM CODING FREEDOM - Effortlessly compatible with Windows, Mac, and Linux—code anywhere, anytime.
COMPACT BREADBOARD READY DESIGN - Smaller than classic boards, fits perfectly into your prototyping setup without clutter.

The LAFVIN Nano V3.0 is a compact, breadboard-friendly microcontroller board featuring the original ATmega328P MCU and an upgraded CH340G USB interface. Fully compatible with Arduino IDE and major operating systems (Windows, Mac, Linux), it offers reliable 5V power and supports ISP and USB programming. Sold in a convenient triple pack with USB cables, it’s perfect for professional makers and developers seeking efficient, versatile prototyping tools.

Specifications

ASIN	B07G99NNXL
Best Sellers Rank	#637 in USB Cables
Brand	LAFVIN
Compatible Devices	Personal Computer
Customer Reviews	4.5 4.5 out of 5 stars (2,245)
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 Name	Classic
UPC	781520418697
Unit Count	3.0 Count

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