I'll google it for you......yes the sd300 is the newer thinner cable used with the 12s di2 groups.

i'm looking this cable to update the DI2 shifters firmware, after the firmware is upgraded the cable is not needed anymore ?

The ew-300 cable is only used on the newer 12 speed systems. Those systems have a Bluetooth system built into the rear derailleur that uses the Shimano app to upgrade the firmware. You use the Shimano e-tube app on your cell phone. The older systems use a special interface adapter that you have to purchase to do that. Short answer is that you never need that cable to do a firmware upgrade.

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Shimano Ew-Sd300 E-Tube Di2 Wire

Product ID: 417640649

Details

Brand
SHIMANO
Cable type
HDMI
Compatible devices
Shimano Di2
Connector type
USB Type C
Special features
Portable

MX$2479

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Sold byAmazon MexicoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

Compatibility: [road bike drivetrains] Shimano Ultegra R8100 and Dura-Ace R9200, [e-bike] Shimano EP800 drive units
Activity: road cycling, e-bike
Manufacturer Warranty: 2 years

With the launch of the updated 12-speed Di2 drive trains from Shimano Dura-Ace and Ultegra comes a new electronic tube cable based on technology developed for Shimano's industry-leading e-bike systems. The SD300 cable is more compact and lighter than previous electronic tube cables, and comes in a wide variety of lengths so you can connect your derailleurs to the Di2 battery regardless of frame size or shape.

Specifications

ASIN	B08X1YSN8L
Best Sellers Rank	#25,978 in Sporting Goods ( See Top 100 in Sporting Goods ) #8 in Bike Cables
Brand Name	SHIMANO
Cable Type	HDMI
Color	Black
Compatible Devices	Shimano Di2 105 R7150/R7170, Ultegra R8150/R8170, Dura-Ace R9150/R9170 Systems
Compatible Phone Models	No Compatible Phone Models
Connector Gender	Male-to-Male
Connector Type	USB Type C
Customer Reviews	4.7 4.7 out of 5 stars (154)
Global Trade Identification Number	00192790635286
Included Components	E-Tubes, Cables & Extensions
Indoor Outdoor Usage	Indoor
Item Length	150 Millimeters
Item Weight	41 g
Manufacturer	SHIMANO
Model	Shimano
Model Name	EW-SD300 eTube Di2 Wire
Number of Items	1
Other Special Features of the Product	Portable
Part Number	IEWSD300L140
Recommended Uses For Product	Bicycle Electronic Shifting Systems
UPC	192790635286
Unit Count	1.0 Count

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TrustScore 4.5 | 7,300+ reviews

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MX$2479

Duties & taxes included

In stock

Sold byAmazon MexicoDelivered 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 Mexico.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Fantastic experience overall. Will recommend to friends and family.

1 month ago

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3 weeks ago

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