diff --git a/src/isp.c b/src/isp.c
index c378d4c5..37d6b481 100644
--- a/src/isp.c
+++ b/src/isp.c
@@ -126,6 +126,7 @@ int isp_init(void)
                     heap_top = 0xe00000;
                     break;
                 case V13_5:
+                case V13_6_2:
                     heap_top = 0xf00000;
                     break;
                 default:
@@ -136,6 +137,7 @@ int isp_init(void)
         case ISP_VER_T6020:
             switch (os_firmware.version) {
                 case V13_5:
+                case V13_6_2:
                     heap_top = 0xf00000;
                     break;
                 default:
diff --git a/src/kboot.c b/src/kboot.c
index bd8ed539..ce36401c 100644
--- a/src/kboot.c
+++ b/src/kboot.c
@@ -1930,7 +1930,18 @@ static int dt_set_isp_fwdata(void)
     if (firmware_set_fdt(dt, fdt_node, "apple,firmware-version", &os_firmware) < 0)
         bail("FDT: Could not set apple,firmware-version for %s\n", fdt_path);
 
-    if (firmware_set_fdt(dt, fdt_node, "apple,firmware-compat", &os_firmware) < 0)
+    const struct fw_version_info *compat;
+
+    switch (os_firmware.version) {
+        case V13_6_2:
+            compat = &fw_versions[V13_5];
+            break;
+        default:
+            compat = &os_firmware;
+            break;
+    }
+
+    if (firmware_set_fdt(dt, fdt_node, "apple,firmware-compat", compat) < 0)
         bail("FDT: Could not set apple,firmware-compat for %s\n", fdt_path);
 
     if (isp_get_heap(&phys, &iova, &size)) {