Add r4xmp.com and unlabeled carts to documentation

Author: coderkei

docs/index.md

@@ -48,6 +48,7 @@ If you'd like to improve this resource or add new carts, feel free to create a p
     - \### in 1 combo cart
     - r4azure.com carts
     - r4inp.com carts
+    - r4xmp.com carts
     - r4isdhc.com.cn carts
     - r4iwood.cn carts
     - r4isdhc.hk 2020+ carts
@@ -56,6 +57,7 @@ If you'd like to improve this resource or add new carts, feel free to create a p
     - r4ixds.com 2014 white version
     - woodr4isdhc.com carts
     - ge.ndsi.in GEi HOT
+    - Unlabeled carts with a red PCB
 
 ### R4iTT Family
 
@@ -130,4 +132,4 @@ If you'd like to improve this resource or add new carts, feel free to create a p
 - [**EZ Flash Parallel**](cart-guides/ezflash_parallel.md "<img src="images/ez_flash_parallel.png" alt="EZ Flash Parallel" width="100">") - ezflash.cn
 - [**N-Card and Clones**](cart-guides/ncard.md "<img src="images/ncard.png" alt="N-Card" width="100">") - dsgba.com
 
-&nbsp;
+&nbsp;