Fix hardhat-ledger in some chains

.changeset/silver-kids-argue.md

@@ -0,0 +1,5 @@
+---
+"@nomicfoundation/hardhat-ledger": patch
+---
+
+Fix hardhat-ledger when eth_accounts isn't available.

packages/hardhat-ledger/src/provider.ts

@@ -120,7 +120,20 @@ export class LedgerProvider extends ProviderWrapperWithChainId {
     }
 
     if (args.method === "eth_accounts") {
-      const accounts = (await this._wrappedProvider.request(args)) as string[];
+      // some rpcs return "the method has been deprecated: eth_accounts" error
+      let accounts: string[];
+      try {
+        accounts = (await this._wrappedProvider.request(args)) as string[];
+      } catch (error) {
+        if (
+          error instanceof Error &&
+          error.message.includes("deprecated: eth_accounts")
+        ) {
+          accounts = [];
+        } else {
+          throw error;
+        }
+      }
       return [...accounts, ...this.options.accounts];
     }
 
@@ -305,6 +318,10 @@ export class LedgerProvider extends ProviderWrapperWithChainId {
     if (txRequest.data !== undefined) {
       baseTx.data = toHex(txRequest.data);
     }
+    // force legacy tx type if EIP-1559 fields are not present
+    if (!hasEip1559Fields) {
+      baseTx.type = 0;
+    }
 
     const txToSign =
       ethers.Transaction.from(baseTx).unsignedSerialized.substring(2);