diff --git a/.prettierignore b/.prettierignore
index aa54149d15..9194904cd3 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1,5 +1,5 @@
 package.json
-src/load
+src/load/tokens
 src/generated
 src/crypto/sha256.js
 src/data/icons
\ No newline at end of file
diff --git a/package.json b/package.json
index 5745dad6b3..58341b9364 100644
--- a/package.json
+++ b/package.json
@@ -64,14 +64,14 @@
     "@ledgerhq/compressjs": "1.3.2",
     "@ledgerhq/devices": "5.15.0",
     "@ledgerhq/errors": "5.15.0",
-    "@ledgerhq/hw-app-btc": "^5.15.1",
+    "@ledgerhq/hw-app-btc": "^5.15.2",
     "@ledgerhq/hw-app-eth": "5.15.0",
     "@ledgerhq/hw-app-str": "^5.15.0",
     "@ledgerhq/hw-app-trx": "5.15.0",
     "@ledgerhq/hw-app-xrp": "5.15.0",
     "@ledgerhq/hw-transport": "5.15.0",
     "@ledgerhq/hw-transport-mocker": "^5.15.0",
-    "@ledgerhq/hw-transport-node-speculos": "^5.15.0",
+    "@ledgerhq/hw-transport-node-speculos": "^5.15.2",
     "@ledgerhq/logs": "5.15.0",
     "async": "^3.2.0",
     "axios": "0.19.0",
diff --git a/src/load/speculos.js b/src/load/speculos.js
index a6980e44af..9aa8f22ec4 100644
--- a/src/load/speculos.js
+++ b/src/load/speculos.js
@@ -2,7 +2,10 @@
 // Ledger internal speculos testing framework.
 // loading this file have side effects and is only for Node.
 
+import path from "path";
+import semver from "semver";
 import { spawn, exec } from "child_process";
+import { promises as fsp } from "fs";
 import invariant from "invariant";
 import { log } from "@ledgerhq/logs";
 import SpeculosTransport from "@ledgerhq/hw-transport-node-speculos";
@@ -18,6 +21,86 @@ export function releaseSpeculosDevice(id: ?string) {
   if (obj) obj.destroy();
 }
 
+export type AppCandidate = {
+  path: string,
+  model: DeviceModelId,
+  firmware: string,
+  appName: string,
+  appVersion: string,
+};
+
+const modelMap: { [_: string]: DeviceModelId } = {
+  blue: "blue",
+  nanox: "nanoX",
+  nanos: "nanoS",
+};
+
+// list all possible apps. sorted by latest first
+export async function listAppCandidates(cwd: string): Promise<AppCandidate[]> {
+  let candidates = [];
+  const models = await fsp.readdir(cwd);
+  for (const modelName of models) {
+    const model = modelMap[modelName.toLowerCase()];
+    if (!model) continue;
+    const p1 = path.join(cwd, modelName);
+    const firmwares = (await fsp.readdir(p1)).filter(semver.valid);
+    firmwares.sort((a, b) => semver.compare(a, b));
+    for (const firmware of firmwares) {
+      const p2 = path.join(p1, firmware);
+      const appNames = await fsp.readdir(p2);
+      for (const appName of appNames) {
+        const p3 = path.join(p2, appName);
+        const elfs = await fsp.readdir(p3);
+        const c = [];
+        for (const elf of elfs) {
+          if (elf.startsWith("app_") && elf.endsWith(".elf")) {
+            const p4 = path.join(p3, elf);
+            const appVersion = elf.slice(4, elf.length - 4);
+            if (semver.valid(appVersion)) {
+              c.push({
+                path: p4,
+                model,
+                firmware,
+                appName,
+                appVersion,
+              });
+            }
+          }
+        }
+        c.sort((a, b) => semver.compare(a.appVersion, b.appVersion));
+        candidates = candidates.concat(c);
+      }
+    }
+  }
+  return candidates;
+}
+
+export type AppSearch = {
+  model: DeviceModelId,
+  firmware: string,
+  appName: string,
+  appVersion: string,
+};
+
+export function appCandidatesMatches(
+  appCandidate: AppCandidate,
+  search: $Shape<AppSearch>
+): boolean {
+  return (
+    (!search.model || search.model === appCandidate.model) &&
+    (!search.appName || search.appName === appCandidate.appName) &&
+    (!search.firmware ||
+      semver.satisfies(appCandidate.firmware, search.firmware)) &&
+    (!search.appVersion ||
+      semver.satisfies(appCandidate.appVersion, search.appVersion))
+  );
+}
+
+export const findAppCandidate = (
+  appCandidates: AppCandidate[],
+  search: $Shape<AppSearch>
+): ?AppCandidate => appCandidates.find((c) => appCandidatesMatches(c, search));
+
 export async function createSpeculosDevice({
   model,
   firmware,
@@ -34,7 +117,7 @@ export async function createSpeculosDevice({
   dependency?: string,
   seed: string,
   // Folder where we have app binaries
-  coinapps: string
+  coinapps: string,
 }): Promise<{
   transport: SpeculosTransport,
   id: string,
diff --git a/yarn.lock b/yarn.lock
index 716b560641..4f8c029189 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1177,10 +1177,10 @@
   resolved "https://registry.yarnpkg.com/@ledgerhq/errors/-/errors-5.15.0.tgz#e5d5b5ad48fc07f6308b78b065242e158bc044a2"
   integrity sha512-ZlLhR7qaChPgEbvcqOptRepWGm8VhhwOM6kC1gx3WErutbtaOjUX8lLA4ButWFU2f+xTl2rS/5c86wC7qGqGXQ==
 
-"@ledgerhq/hw-app-btc@^5.15.1":
-  version "5.15.1"
-  resolved "https://registry.yarnpkg.com/@ledgerhq/hw-app-btc/-/hw-app-btc-5.15.1.tgz#6e9f31f581b6899b1496e11a91d38134260bc958"
-  integrity sha512-0+2wZEJ3Ud6N5Vr++qTfIImee8HjoHC1hZB98MkCeNGG6zizESbcXL9RJI88gV2fk3b9o1HUd86po1P7QvEpcQ==
+"@ledgerhq/hw-app-btc@^5.15.2":
+  version "5.15.2"
+  resolved "https://registry.yarnpkg.com/@ledgerhq/hw-app-btc/-/hw-app-btc-5.15.2.tgz#a1c8b5a16915c92d4d21ad5e2962b0310c4473e8"
+  integrity sha512-mpjANAFEtFfvb9BwiijDZOAEWlON/G6ieORNpJ4GM2u7Lanlo39IANo3K68ootGnS15QdfAdZw34SzdzLfIIYg==
   dependencies:
     "@ledgerhq/hw-transport" "^5.15.0"
     bip32-path "^0.4.2"
@@ -1232,10 +1232,10 @@
     "@ledgerhq/hw-transport" "^5.15.0"
     "@ledgerhq/logs" "^5.15.0"
 
-"@ledgerhq/hw-transport-node-speculos@^5.15.0":
-  version "5.15.0"
-  resolved "https://registry.yarnpkg.com/@ledgerhq/hw-transport-node-speculos/-/hw-transport-node-speculos-5.15.0.tgz#df1d782b0ace14beaa66cd6d6dd2f1fa83e5f40d"
-  integrity sha512-7m4LLofrJHpr1cPLUqKqjyQkBOss+e+JWzAdQAQCUPn1IyQyaJf87h3DsbQuqu3cAU0umMy0GlXoNFh4oED+Iw==
+"@ledgerhq/hw-transport-node-speculos@^5.15.2":
+  version "5.15.2"
+  resolved "https://registry.yarnpkg.com/@ledgerhq/hw-transport-node-speculos/-/hw-transport-node-speculos-5.15.2.tgz#3e347120faa9765d75ac88adca12e4ec54416d36"
+  integrity sha512-lhM0EYCtnuzTl8Xpgp/CVsupw4u+KCCtvIL2kqOygXccvfX8VdQuo03C/JXm8mJoH99EHK+lJHqTdhorg2Yl7A==
   dependencies:
     "@ledgerhq/errors" "^5.15.0"
     "@ledgerhq/hw-transport" "^5.15.0"