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
5.67 g
Style
Classic

⚡16MHz high-speed clock

💻Cross-platform USB CH340G interface

🔌5V power supply compatibility

Rp750263

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Description

🚀 Elevate your DIY projects with the Nano V3.0 – where compact power meets ultimate compatibility!

TRIPLE PACK VALUE - Get three Nano V3.0 boards with USB cables—perfect for multitasking projects or sharing the innovation.
UNIVERSAL OS SUPPORT - Works flawlessly across Windows, Mac, and Linux, ensuring no barriers to your creativity.
ROBUST A TMEGA 328 P MCU - Powered by the reliable Atmel ATmega328P-AU for stable and efficient microcontroller performance.
COMPACT BREADBOARD FRIENDLY - Sleek Nano form factor fits perfectly on breadboards, saving precious workspace.
SEAMLESS ARDUINO IDE INTEGRATION - Plug-and-play compatibility with Arduino IDE for effortless coding and prototyping.

The Nano V3.0 is a compact, breadboard-friendly microcontroller board featuring the original ATmega328P chip and upgraded CH340G USB interface. Operating at 5V and 16MHz, it offers seamless compatibility with Arduino IDE and supports Windows, Mac, and Linux systems. Sold in a convenient triple pack with USB cables, it’s ideal for professional-grade prototyping and development.

Specifications

ASIN	B07G99NNXL
Best Sellers Rank	#657 in USB Cables
Brand	LAFVIN
Compatible Devices	Personal Computer
Customer Reviews	4.6 4.6 out of 5 stars (2,257)
Hardware Interface	USB
Item Weight	5.67 g
Manufacturer	LAFVIN
Mfr Part Number	LA-020
Model Number	8541582500
Number of Items	3
Number of Packs	3
Operating System	Linux,Mac,Operating,Windows
Style Name	Classic
UPC	781520418697
Unit Count	3 Count

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Rp750263

Duties & taxes included

In stock

Sold byAmazon IndonesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Indonesia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

View all Trustpilot reviews