diff --git a/edk2-rockchip/Platform/FydeInnovations/FydetabDuo/AcpiTables/Dsdt.asl b/edk2-rockchip/Platform/FydeInnovations/FydetabDuo/AcpiTables/Dsdt.asl
index 8e190b4f..689c760b 100644
--- a/edk2-rockchip/Platform/FydeInnovations/FydetabDuo/AcpiTables/Dsdt.asl
+++ b/edk2-rockchip/Platform/FydeInnovations/FydetabDuo/AcpiTables/Dsdt.asl
@@ -21,6 +21,14 @@
 #define BOARD_CODEC_GPIO "\\_SB.GPI1"
 #define BOARD_CODEC_GPIO_PIN GPIO_PIN_PC0
 
+//
+// WORKAROUND:
+// SDMMC may be unreliable at UHS-I speeds.
+//
+#define SDMMC_CAP_DDR50 0
+#define SDMMC_CAP_SDR50 0
+#define SDMMC_CAP_SDR104 0
+
 DefinitionBlock ("Dsdt.aml", "DSDT", 2, "RKCP  ", "RK3588  ", 2)
 {
   Scope (\_SB_)
diff --git a/edk2-rockchip/Silicon/Rockchip/RK3588/AcpiTables/Sdhc.asl b/edk2-rockchip/Silicon/Rockchip/RK3588/AcpiTables/Sdhc.asl
index 2f5da837..058e8e94 100644
--- a/edk2-rockchip/Silicon/Rockchip/RK3588/AcpiTables/Sdhc.asl
+++ b/edk2-rockchip/Silicon/Rockchip/RK3588/AcpiTables/Sdhc.asl
@@ -8,6 +8,16 @@
 
 #include "AcpiTables.h"
 
+#ifndef SDMMC_CAP_DDR50
+#define SDMMC_CAP_DDR50 1
+#endif
+#ifndef SDMMC_CAP_SDR50
+#define SDMMC_CAP_SDR50 1
+#endif
+#ifndef SDMMC_CAP_SDR104
+#define SDMMC_CAP_SDR104 1
+#endif
+
 Scope (\_SB_) {
   Name (SDRM, 1) // SD slot is removable
 
@@ -41,9 +51,9 @@ Scope (\_SB_) {
         Package () { "max-frequency", 200000000 },
         Package () { "bus-width", 4 },
         Package () { "cap-sd-highspeed", 1 },
-        Package () { "sd-uhs-ddr50", 1 },
-        Package () { "sd-uhs-sdr50", 1 },
-        Package () { "sd-uhs-sdr104", 1 },
+        Package () { "sd-uhs-ddr50", SDMMC_CAP_DDR50 },
+        Package () { "sd-uhs-sdr50", SDMMC_CAP_SDR50 },
+        Package () { "sd-uhs-sdr104", SDMMC_CAP_SDR104 },
       }
     })