diff --git a/NEWS.adoc b/NEWS.adoc
index 16e339db4a..b245e3d1e9 100644
--- a/NEWS.adoc
+++ b/NEWS.adoc
@@ -49,6 +49,11 @@ https://github.com/networkupstools/nut/milestone/13
       descriptor lengths, which could cause a segmentation fault (regression
       added in NUT v2.8.5 release). [PR #3550]
 
+ - USB drivers now prefer the longer of conflicting HID report descriptor
+   lengths for EcoFlow devices using USB ID `3746:ffff`. This makes the
+   complete descriptor available on affected River 3 Plus firmware while
+   retaining the shorter length as a fallback.
+
  - Windows serial compatibility: fixed timeout handling to return data
    already received as a successful short read, while safely canceling
    and completing pending overlapped I/O before reusing its state.
diff --git a/drivers/libusb0.c b/drivers/libusb0.c
index 8471136efb..ceb6d624a0 100644
--- a/drivers/libusb0.c
+++ b/drivers/libusb0.c
@@ -48,7 +48,7 @@
 #include "strcasestr-static.h"
 
 #define USB_DRIVER_NAME		"USB communication driver (libusb 0.1)"
-#define USB_DRIVER_VERSION	"0.53"
+#define USB_DRIVER_VERSION	"0.54"
 
 /* driver description structure */
 upsdrv_info_t comm_upsdrv_info = {
@@ -631,6 +631,12 @@ static int nut_libusb_open(usb_dev_handle **udevp,
 				rdlens[0] = rdlen1;
 				rdlens[1] = rdlen2;
 			}
+			else if ((curDevice->VendorID == 0x3746) && (curDevice->ProductID == 0xffff)
+				&& (rdlen1 != rdlen2)) {
+				upsdebugx(1, "EcoFlow device. Trying longer report descriptor first");
+				rdlens[0] = rdlen1 > rdlen2 ? rdlen1 : rdlen2;
+				rdlens[1] = rdlen1 > rdlen2 ? rdlen2 : rdlen1;
+			}
 			else {
 				rdlens[0] = rdlen2 >= 0 ? rdlen2 : rdlen1;
 				rdlens[1] = rdlen2 >= 0 ? rdlen1 : rdlen2;
diff --git a/drivers/libusb1.c b/drivers/libusb1.c
index e9f6c855c4..d250825ea9 100644
--- a/drivers/libusb1.c
+++ b/drivers/libusb1.c
@@ -47,7 +47,7 @@
 #endif
 
 #define USB_DRIVER_NAME		"USB communication driver (libusb 1.0)"
-#define USB_DRIVER_VERSION	"0.54"
+#define USB_DRIVER_VERSION	"0.55"
 
 /* driver description structure */
 upsdrv_info_t comm_upsdrv_info = {
@@ -788,6 +788,12 @@ static int nut_libusb_open(libusb_device_handle **udevp,
 			rdlens[0] = rdlen1;
 			rdlens[1] = rdlen2;
 		}
+		else if ((curDevice->VendorID == 0x3746) && (curDevice->ProductID == 0xffff)
+			&& (rdlen1 != rdlen2)) {
+			upsdebugx(1, "EcoFlow device. Trying longer report descriptor first");
+			rdlens[0] = rdlen1 > rdlen2 ? rdlen1 : rdlen2;
+			rdlens[1] = rdlen1 > rdlen2 ? rdlen2 : rdlen1;
+		}
 		else {
 			rdlens[0] = rdlen2 >= 0 ? rdlen2 : rdlen1;
 			rdlens[1] = rdlen2 >= 0 ? rdlen1 : rdlen2;