After waiting for three days, I finally received the ThinkPad X1 Carbon 4th, the first thing is upgrading the SSD. My new SSD is Samsung 512G 950pro.
Samsung V-NAND 512G 950 PRO SSD
Form Factor: M.2 (2280)
Interface: PCIe 3.0 x4 (up to 32 Gb/s) NVMe 1.1
NAND Type: Samsung V-NAND
Sequential read: up to 2,500 MB/S, sequential write: up to 1,500 MB/S, 4K random read: up to 300,000 IOPS, 4K random write: up to 110,000 IOPS.
More information about Samsung V-NAND 512G 950 PRO, please go to Samsung.com.
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Remove all screws from the bottom case.
Pry up and remove the case.
When the bottom case was removed, we can access the internal components, including SSD, battery, wireless card, CMOS battery and cooling fan module.
The SSD is covering by a black insulating paper, open the paper, you can access the wireless card and SSD.
The SSD has been installed successfully.
From the picture, Lenovo ThinkPad X1 Carbon 4th features a 15.2V, 3.44Ah, 52Wh Li-ion battery, Lenovo: SB10F46466, 00HW028.
The battery is as same as ThinkPad X1 Yoga’s battery.