diff --git a/lib/shared/messages/update-relationship-message-spec.js b/lib/shared/messages/update-relationship-message-spec.js
index a02aecf53..9825104c0 100644
--- a/lib/shared/messages/update-relationship-message-spec.js
+++ b/lib/shared/messages/update-relationship-message-spec.js
@@ -1,251 +1,298 @@
 // @flow
 
 import invariant from 'invariant';
 import t from 'tcomb';
 
 import {
   type CreateMessageInfoParams,
   type MessageSpec,
   pushTypes,
 } from './message-spec.js';
 import { assertSingleMessageInfo } from './utils.js';
+import type { PlatformDetails } from '../../types/device-types.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type RawLegacyUpdateRelationshipMessageInfo,
   rawLegacyUpdateRelationshipMessageInfoValidator,
   type LegacyUpdateRelationshipMessageData,
   type LegacyUpdateRelationshipMessageInfo,
 } from '../../types/messages/legacy-update-relationship.js';
+import type { RawUnsupportedMessageInfo } from '../../types/messages/unsupported.js';
 import type {
   RawUpdateRelationshipMessageInfo,
   UpdateRelationshipMessageData,
   UpdateRelationshipMessageInfo,
 } from '../../types/messages/update-relationship.js';
 import { rawUpdateRelationshipMessageInfoValidator } from '../../types/messages/update-relationship.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { type EntityText, ET } from '../../utils/entity-text.js';
+import { FUTURE_CODE_VERSION, hasMinCodeVersion } from '../version-utils.js';
 
 type UpdateRelationshipMessageSpec = MessageSpec<
   LegacyUpdateRelationshipMessageData | UpdateRelationshipMessageData,
   RawLegacyUpdateRelationshipMessageInfo | RawUpdateRelationshipMessageInfo,
   LegacyUpdateRelationshipMessageInfo | UpdateRelationshipMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data:
       | LegacyUpdateRelationshipMessageData
       | RawLegacyUpdateRelationshipMessageInfo
       | UpdateRelationshipMessageData
       | RawUpdateRelationshipMessageInfo,
   ) => string,
   ...
 };
 
+const connectionOnFarcasterMessage = 'Your connection on Farcaster is on Comm.';
+
 export const updateRelationshipMessageSpec: UpdateRelationshipMessageSpec =
   Object.freeze({
     messageContentForServerDB(
       data:
         | LegacyUpdateRelationshipMessageData
         | RawLegacyUpdateRelationshipMessageInfo
         | UpdateRelationshipMessageData
         | RawUpdateRelationshipMessageInfo,
     ): string {
       return JSON.stringify({
         operation: data.operation,
         targetID: data.targetID,
       });
     },
 
     messageContentForClientDB(
       data:
         | RawLegacyUpdateRelationshipMessageInfo
         | RawUpdateRelationshipMessageInfo,
     ): string {
       return updateRelationshipMessageSpec.messageContentForServerDB(data);
     },
 
     rawMessageInfoFromServerDBRow(
       row: Object,
     ):
       | RawLegacyUpdateRelationshipMessageInfo
       | RawUpdateRelationshipMessageInfo {
       const content = JSON.parse(row.content);
       return {
         type: row.type,
         id: row.id.toString(),
         threadID: row.threadID.toString(),
         time: row.time,
         creatorID: row.creatorID.toString(),
         targetID: content.targetID,
         operation: content.operation,
       };
     },
 
     rawMessageInfoFromClientDB(
       clientDBMessageInfo: ClientDBMessageInfo,
     ):
       | RawLegacyUpdateRelationshipMessageInfo
       | RawUpdateRelationshipMessageInfo {
       invariant(
         clientDBMessageInfo.content !== undefined &&
           clientDBMessageInfo.content !== null,
         'content must be defined for UpdateRelationship',
       );
       const content = JSON.parse(clientDBMessageInfo.content);
 
       const messageType = parseInt(clientDBMessageInfo.type);
       if (messageType === messageTypes.LEGACY_UPDATE_RELATIONSHIP) {
         return {
           type: messageTypes.LEGACY_UPDATE_RELATIONSHIP,
           id: clientDBMessageInfo.id,
           threadID: clientDBMessageInfo.thread,
           time: parseInt(clientDBMessageInfo.time),
           creatorID: clientDBMessageInfo.user,
           targetID: content.targetID,
           operation: content.operation,
         };
       } else {
         return {
           type: messageTypes.UPDATE_RELATIONSHIP,
           id: clientDBMessageInfo.id,
           threadID: clientDBMessageInfo.thread,
           time: parseInt(clientDBMessageInfo.time),
           creatorID: clientDBMessageInfo.user,
           targetID: content.targetID,
           operation: content.operation,
         };
       }
     },
 
     createMessageInfo(
       rawMessageInfo:
         | RawLegacyUpdateRelationshipMessageInfo
         | RawUpdateRelationshipMessageInfo,
       creator: RelativeUserInfo,
       params: CreateMessageInfoParams,
     ): ?LegacyUpdateRelationshipMessageInfo | ?UpdateRelationshipMessageInfo {
       const target = params.createRelativeUserInfos([
         rawMessageInfo.targetID,
       ])[0];
       if (!target) {
         return null;
       }
       if (rawMessageInfo.type === messageTypes.LEGACY_UPDATE_RELATIONSHIP) {
         return {
           type: messageTypes.LEGACY_UPDATE_RELATIONSHIP,
           id: rawMessageInfo.id,
           threadID: rawMessageInfo.threadID,
           creator,
           target,
           time: rawMessageInfo.time,
           operation: rawMessageInfo.operation,
         };
       } else {
         return {
           type: messageTypes.UPDATE_RELATIONSHIP,
           id: rawMessageInfo.id,
           threadID: rawMessageInfo.threadID,
           creator,
           target,
           time: rawMessageInfo.time,
           operation: rawMessageInfo.operation,
         };
       }
     },
 
     rawMessageInfoFromMessageData(
       messageData:
         | LegacyUpdateRelationshipMessageData
         | UpdateRelationshipMessageData,
       id: ?string,
     ):
       | RawLegacyUpdateRelationshipMessageInfo
       | RawUpdateRelationshipMessageInfo {
       invariant(id, 'RawUpdateRelationshipMessageInfo needs id');
       return { ...messageData, id };
     },
 
     // ESLint doesn't recognize that invariant always throws
     // eslint-disable-next-line consistent-return
     robotext(
       messageInfo:
         | LegacyUpdateRelationshipMessageInfo
         | UpdateRelationshipMessageInfo,
     ): EntityText {
       const creator = ET.user({ userInfo: messageInfo.creator });
       if (messageInfo.operation === 'request_sent') {
         const target = ET.user({ userInfo: messageInfo.target });
         return ET`${creator} sent ${target} a friend request`;
       } else if (messageInfo.operation === 'request_accepted') {
         const targetPossessive = ET.user({
           userInfo: messageInfo.target,
           possessive: true,
         });
         return ET`${creator} accepted ${targetPossessive} friend request`;
       } else if (messageInfo.operation === 'farcaster_mutual') {
-        return ET`Your connection on Farcaster is on Comm.`;
+        return ET`${connectionOnFarcasterMessage}`;
       }
       invariant(
         false,
         `Invalid operation ${messageInfo.operation} ` +
           `of message with type ${messageInfo.type}`,
       );
     },
 
+    shimUnsupportedMessageInfo(
+      rawMessageInfo:
+        | RawUpdateRelationshipMessageInfo
+        | RawLegacyUpdateRelationshipMessageInfo,
+      platformDetails: ?PlatformDetails,
+    ):
+      | RawLegacyUpdateRelationshipMessageInfo
+      | RawUpdateRelationshipMessageInfo
+      | RawUnsupportedMessageInfo {
+      if (rawMessageInfo.type === messageTypes.LEGACY_UPDATE_RELATIONSHIP) {
+        return rawMessageInfo;
+      } else if (
+        rawMessageInfo.type === messageTypes.UPDATE_RELATIONSHIP &&
+        hasMinCodeVersion(platformDetails, {
+          native: FUTURE_CODE_VERSION,
+          web: FUTURE_CODE_VERSION,
+          majorDesktop: FUTURE_CODE_VERSION,
+        })
+      ) {
+        return rawMessageInfo;
+      } else if (
+        rawMessageInfo.type === messageTypes.UPDATE_RELATIONSHIP &&
+        rawMessageInfo.operation !== 'farcaster_mutual'
+      ) {
+        return {
+          ...rawMessageInfo,
+          type: messageTypes.LEGACY_UPDATE_RELATIONSHIP,
+          operation: rawMessageInfo.operation,
+        };
+      } else {
+        return {
+          type: messageTypes.UNSUPPORTED,
+          id: rawMessageInfo.id,
+          threadID: rawMessageInfo.threadID,
+          creatorID: rawMessageInfo.creatorID,
+          time: rawMessageInfo.time,
+          robotext: connectionOnFarcasterMessage,
+          unsupportedMessageInfo: rawMessageInfo,
+        };
+      }
+    },
+
     unshimMessageInfo(
       unwrapped:
         | RawLegacyUpdateRelationshipMessageInfo
         | RawUpdateRelationshipMessageInfo,
     ):
       | RawLegacyUpdateRelationshipMessageInfo
       | RawUpdateRelationshipMessageInfo {
       return unwrapped;
     },
 
     async notificationTexts(
       messageInfos: $ReadOnlyArray<MessageInfo>,
       threadInfo: ThreadInfo,
     ): Promise<NotifTexts> {
       const messageInfo = assertSingleMessageInfo(messageInfos);
       const creator = ET.user({ userInfo: messageInfo.creator });
       const prefix = ET`${creator}`;
       const title = threadInfo.uiName;
 
       let body;
       if (messageInfo.operation === 'request_sent') {
         body = 'sent you a friend request';
       } else if (messageInfo.operation === 'request_accepted') {
         body = 'accepted your friend request';
       } else if (messageInfo.operation === 'farcaster_mutual') {
         body = 'from Farcaster is on Comm';
       } else {
         invariant(false, 'unknown messageInfo.operation in notificationTexts');
       }
 
       const merged = ET`${prefix} ${body}`;
       return {
         merged,
         body,
         title,
         prefix,
       };
     },
 
     generatesNotifs: async () => pushTypes.NOTIF,
 
     canBeSidebarSource: true,
 
     canBePinned: false,
 
     validator: t.union([
       rawLegacyUpdateRelationshipMessageInfoValidator,
       rawUpdateRelationshipMessageInfoValidator,
     ]),
   });